Entity Central Index Key Permanent items in income tax reconciliation. Business combination recognized identifiable assets acquired and liabilities assumed land and buildings. Cover [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Current Fiscal Year End Date Current Fiscal Year End Date Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Document Fiscal Period Focus Document Fiscal Period Focus Document Fiscal Year Focus Document Fiscal Year Focus Entity Public Float Entity Public Float Trading Symbol Trading Symbol Entity Emerging Growth Company Entity Emerging Growth Company Entity Small Business Entity Small Business Entity Shell Company Entity Shell Company Entity File Number Entity File Number Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address Address Line1 Entity Address, City or Town Entity Address City Or Town Entity Address, State or Province Entity Address State Or Province Entity Address, Postal Zip Code Entity Address Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Entity Interactive Data Current Entity Interactive Data Current Title of 12(b) Security Security12b Title Security Exchange Name Security Exchange Name Entity Incorporation, State or Country Code Entity Incorporation State Country Code Document Annual Report Document Annual Report Document Transition Report Document Transition Report Entity Voluntary Filers Entity Voluntary Filers Entity Well-known Seasoned Issuer Entity Well Known Seasoned Issuer ICFR Auditor Attestation Flag Icfr Auditor Attestation Flag Condensed consolidated statements of operations. Condensed Consolidated Statements Of Operations Net sales Revenues Cost of goods sold Cost Of Goods And Services Sold Gross profit Gross Profit Selling, general and administrative expenses Selling General And Administrative Expense Operating income Operating Income Loss Non-operating items: Interest And Other Income [Abstract] Interest expense Interest Expense Debt Interest income Investment Income Interest Interest expense, net Interest Income Expense Net Other expense Other Nonoperating Income Expense Total other expense, net Nonoperating Income Expense Income before income tax expense Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Income tax expense Income Tax Expense Benefit Net income Net Income Loss Basic earnings per share Earnings Per Share Basic Diluted earnings per share Earnings Per Share Diluted Condensed consolidated statements of comprehensive income. Condensed Consolidated Statements Of Comprehensive Loss Income [Abstract] Net income Other comprehensive gain Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent [Abstract] Foreign currency translation Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax Change in net prior service credit and actuarial gains, net of income tax expense Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax Total other comprehensive income (loss) Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent Comprehensive income Comprehensive Income Net Of Tax Mortgage payable non current. Statement Of Financial Position [Abstract] Statement [Table] Statement [Table] Debt Instrument Debt Instrument [Axis] Debt Instrument, Name Debt Instrument Name [Domain] Paycheck protection program. PPP Loan Paycheck Protection Program [Member] Statement [Line Items] Statement [Line Items] ASSETS Assets [Abstract] Current assets: Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Accounts receivable, less allowance Accounts Receivable Net Current Inventories Inventory Net Prepaid expenses and other current assets Prepaid Expense And Other Assets Current Total current assets Assets Current Property, plant and equipment: Property Plant And Equipment Net [Abstract] Land Land Buildings Buildings And Improvements Gross Machinery and equipment Machinery And Equipment Gross Total property, plant and equipment Property Plant And Equipment Gross Less: accumulated depreciation Accumulated Depreciation Depletion And Amortization Property Plant And Equipment Net property, plant and equipment Property Plant And Equipment Net Intangible assets, less accumulated amortization Intangible Assets Net Excluding Goodwill Goodwill Goodwill Operating lease right-of-use asset, net Operating Lease Right Of Use Asset Other assets Other Assets Noncurrent Total assets Assets LIABILITIES Liabilities [Abstract] Current liabilities: Liabilities Current [Abstract] Accounts payable Accounts Payable Current Operating lease liability - current portion Operating Lease Liability Current Current portion of mortgage payable Secured Debt Current Other accrued liabilities Accrued Liabilities Current Total current liabilities Liabilities Current Long-term debt Long Term Debt Noncurrent Mortgage payable, net of current portion Mortgage Payable Non Current Operating lease liability - non-current portion Operating Lease Liability Noncurrent Deferred income taxes Deferred Income Tax Liabilities Net Other non-current liabilities Other Liabilities Noncurrent Total liabilities Liabilities STOCKHOLDERS' EQUITY Stockholders Equity [Abstract] Common stock, par value $2.50: authorized 8,000,000 shares; issued - 4,840,571 shares in 2020 and 4,838,071 in 2019, including treasury stock Common Stock Value Treasury stock, at cost, 1,501,658 in 2020 and 1,487,238 shares in 2019 Treasury Stock Value Additional paid-in capital Additional Paid In Capital Accumulated other comprehensive loss Accumulated Other Comprehensive Income Loss Net Of Tax Retained earnings Retained Earnings Accumulated Deficit Total stockholders' equity Stockholders Equity Total liabilities and stockholders' equity Liabilities And Stockholders Equity Common stock, par value Common Stock Par Or Stated Value Per Share Common stock, shares authorized Common Stock Shares Authorized Common stock, shares issued Common Stock Shares Issued Treasury stock, shares Treasury Stock Shares Adjustments to additional paid in capital cash settlement of stock options. Statement Of Stockholders Equity [Abstract] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common Stock Common Stock [Member] Treasury Stock Treasury Stock [Member] Additional Paid-In Capital Additional Paid In Capital [Member] Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Income [Member] Retained Earnings Retained Earnings [Member] Cumulative Effect, Period of Adoption Cumulative Effect Period Of Adoption [Axis] Cumulative Effect, Period of Adoption Cumulative Effect Period Of Adoption [Domain] Cumulative Effect, Period of Adoption, Adjustment Cumulative Effect Period Of Adoption Adjustment [Member] Beginning Balance Beginning Balance, shares Common Stock Shares Outstanding Other comprehensive Income Accounting Standards Update [Extensible List] Accounting Standards Update Extensible List Stock compensation expense Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Distribution to shareholders Dividends Common Stock Cash Issuance of common stock Stock Issued During Period Value New Issues Issuance of common stock (shares) Stock Issued During Period Shares New Issues Cash settlement of stock options Adjustments To Additional Paid In Capital Cash Settlement Of Stock Options Purchase of treasury stock Stock Repurchased During Period Value Purchase of treasury stock (shares) Stock Repurchased During Period Shares Ending Balance Ending Balance, shares Non cash lease expense. Repayments on mortgage. Cash payment for settlement of stock options. Statement Of Cash Flows [Abstract] Business Acquisition Business Acquisition [Axis] Business Acquisition, Acquiree Business Acquisition Acquiree [Domain] Med-Nap, LLC. Med-Nap, LLC Med Nap L L C [Member] First Aid Central. First Aid Central First Aid Central [Member] PPP Loan Operating activities: Net Cash Provided By Used In Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Depreciation Depreciation Amortization Adjustment For Amortization Stock compensation expense Share Based Compensation Deferred income taxes Deferred Income Taxes And Tax Credits Non-cash lease expense Non Cash Lease Expense Provision for doubtful accounts Provision For Doubtful Accounts Pension settlement Pension Expense Reversal Of Expense Noncash Changes in operating assets and liabilities Increase Decrease In Operating Capital [Abstract] Accounts receivable Increase Decrease In Receivables Inventories Increase Decrease In Inventories Prepaid expenses and other current assets Increase Decrease In Prepaid Deferred Expense And Other Assets Accounts payable Increase Decrease In Accounts Payable Other accrued liabilities Increase Decrease In Other Accrued Liabilities Total adjustments Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities Net cash provided by operating activities Net Cash Provided By Used In Operating Activities Investing activities: Net Cash Provided By Used In Investing Activities [Abstract] Purchase of property, plant and equipment Payments To Acquire Property Plant And Equipment Acquisition Payments To Acquire Assets Investing Activities Net cash used by investing activities Net Cash Provided By Used In Investing Activities Financing activities: Net Cash Provided By Used In Financing Activities [Abstract] Net borrowings (repayments) of long-term debt Proceeds From Repayments Of Long Term Debt And Capital Securities Proceeds from PPP Loan Proceeds From Issuance Of Long Term Debt Repayments on mortgage Repayments On Mortgage Distributions to stockholders Payments Of Dividends Cash settlement of stock options Payments Related To Cash Settlement Of Share Based Compensation Purchase of treasury stock Payments For Repurchase Of Equity Issuance of common stock Proceeds From Issuance Of Common Stock Net cash provided by (used in) financing activities Net Cash Provided By Used In Financing Activities Effect of exchange rate changes Effect Of Exchange Rate On Cash And Cash Equivalents Net (decrease) increase in cash and cash equivalents Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect Cash and cash equivalents at beginning of year Cash and cash equivalents at end of year Supplemental cash flow information: Supplemental Cash Flow Information [Abstract] Cash paid for income taxes Income Taxes Paid Net Cash paid for interest expense Interest Paid Net Documents Incorporated by Reference Documents Incorporated By Reference [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Operations Nature Of Operations Accounting Policies [Abstract] Accounting Policies Significant Accounting Policies [Text Block] Inventory Disclosure [Abstract] Inventories Inventory Disclosure [Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Intangible Assets and Goodwill Intangible Assets Disclosure [Text Block] Payables And Accruals [Abstract] Other Accrued Liabilities Accounts Payable And Accrued Liabilities Disclosure [Text Block] Compensation And Retirement Disclosure [Abstract] Pension and Profit Sharing Pension And Other Postretirement Benefits Disclosure [Text Block] Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Long-term Debt And Shareholders Equity Debt [Abstract] Long-Term Debt and Shareholders' Equity Debt Disclosure [Text Block] Revenue From Contract With Customer [Abstract] Revenue from Contracts with Customers Revenue From Contract With Customer [Text Block] Segment Information Segment Information [Abstract] Segment Information Segment Reporting Disclosure [Text Block] Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Stock Option Plans Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Earnings Per Share [Abstract] Earnings Per Share Earnings Per Share [Text Block] Equity [Abstract] Accumulated Other Comprehensive Loss Comprehensive Income Note [Text Block] Financial Instruments Financial Instruments [Abstract] Financial Instruments Fair Value Disclosures [Text Block] Leases [Abstract] Leases Lessee Operating Leases [Text Block] Business Combinations [Abstract] Business Combinations Business Combination Disclosure [Text Block] Estimates Use Of Estimates Principles of Consolidation Consolidation Policy [Text Block] Translation of Foreign Currency Foreign Currency Transactions And Translations Policy [Text Block] Cash Equivalents Cash And Cash Equivalents Policy [Text Block] Accounts Receivable Receivables Policy [Text Block] Inventories Inventory Policy [Text Block] Property, Plant and Equipment and Depreciation Property Plant And Equipment Policy [Text Block] Intangible Assets and Goodwill Goodwill And Intangible Assets Policy [Text Block] Deferred Income Taxes Income Tax Policy [Text Block] Leases Lessee Leases Policy [Text Block] Revenue Recognition Revenue Recognition Policy [Text Block] Research and Development Research Development And Computer Software Policy [Text Block] Shipping costs.​ Shipping Costs Shipping Costs Policy [Text Block] Advertising Costs Advertising Costs Policy [Text Block] Subsequent Events Subsequent Events Policy Policy [Text Block] Concentration Concentration Risk Credit Risk Recently Issued and Adopted Accounting Standards New Accounting Pronouncements Policy Policy [Text Block] Inventories Schedule Of Inventory Current Table [Text Block] Intangible Assets and Goodwill Schedule Of Intangible Assets And Goodwill Table [Text Block] Accrued Liabilities Schedule Of Accrued Liabilities Table [Text Block] Plan Asset Allocation Schedule Of Allocation Of Plan Assets Table [Text Block] Pension Plan Assets by Level Fair Value Liabilities Measured On Recurring Basis [Text Block] Changes in Benefit Obligation Schedule Of Changes In Accumulated Postemployment Benefit Obligations Table [Text Block] Components of Net Benefit Expense Schedule Of Net Benefit Costs Table [Text Block] Amounts Recognized in Other Comprehensive Income Schedule Of Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Loss Table [Text Block] Income Tax Expense (Benefit) Schedule Of Components Of Income Tax Expense Benefit Table [Text Block] US and Foreign Income Before Income Taxes Schedule Of Income Before Income Tax Domestic And Foreign Table [Text Block] US Statutory Rate Reconciliation Schedule Of Effective Income Tax Rate Reconciliation Table [Text Block] Deferred Tax Assets and Liabilities Schedule Of Deferred Tax Assets And Liabilities Table [Text Block] Disaggregation of Revenues Disaggregation Of Revenue Table [Text Block] Segment information tables. Segment Information Tables [Abstract] Financial Data By Segment Table Schedule Of Segment Reporting Information By Segment [Text Block] Reconciliation of Segment Operating Income to Consolidated Income Before Taxes Reconciliation Of Operating Profit Loss From Segments To Consolidated [Text Block] Revenue by Geographic Area Schedule Of Revenues From External Customers And Long Lived Assets By Geographical Areas Table [Text Block] Stock Option Activity Schedule Of Share Based Compensation Stock Options Activity Table [Text Block] Summary of Options Outstanding Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding And Exercisable Table [Text Block] Assumptions Used to Value Option Grants Schedule Of Share Based Payment Award Stock Options Valuation Assumptions Table [Text Block] Earnings Per Share Schedule Of Earnings Per Share Basic And Diluted Table [Text Block] Accumulated Comprehensive Loss Schedule Of Comprehensive Income Loss Table [Text Block] Leases tables. Leases Tables [Abstract] Information Related to Leases Lease Cost Table [Text Block] Future Minimum Lease Payments Lessee Operating Lease Liability Maturity Table [Text Block] Schedule of Purchase Price Allocation to Assets Acquired and Liabilities Assumed Schedule Of Business Acquisitions By Acquisition [Text Block] Accounting policies. Accounting policies. Accounting Policies [Table] Accounting Policies [Table] Statistical Measurement Range [Axis] Statistical Measurement Range [Member] Minimum Range Minimum [Member] Maximum Range Maximum [Member] Concentration Risk Benchmark Concentration Risk By Benchmark [Axis] Concentration Risk Benchmark Concentration Risk Benchmark [Domain] Exceeded 10% of Consolidated Net Sales Sales Revenue Net [Member] Concentration Risk Type Concentration Risk By Type [Axis] Concentration Risk Type Concentration Risk Type [Domain] Major Customer Customer Concentration Risk [Member] Long-Lived Tangible Asset Property Plant And Equipment By Type [Axis] Long-Lived Tangible Asset Property Plant And Equipment Type [Domain] Buildings Building [Member] Machinery and Equipment Machinery And Equipment [Member] Accounting Policies [Line Items] Accounting Policies [Line Items] Foreign currency transaction gains (losses) during period Foreign Currency Transaction Gain Loss Before Tax Allowance for doubtful accounts Allowance For Doubtful Accounts Receivable Asset useful life Property Plant And Equipment Useful Life Weighted average intangible assets amortization period Finite Lived Intangible Asset Useful Life Research and development costs during period Research And Development Expense Cost incurred during the reporting period in transporting goods and services to customers. Includes freight-out costs. Shipping costs during period Cost Of Goods And Services Sold Shipping And Handling Advertising costs during period Advertising Expense Number of major customers representing 10% or more of specified benchmarks. Net sales to major customers Concentration Risk Percentage1 Number of major customers Concentration Risk Number Of Major Customers Finished goods Inventory Finished Goods Net Of Reserves Work in process Inventory Work In Process Net Of Reserves Materials and supplies Inventory Raw Materials And Supplies Net Of Reserves Inventories: Inventory valuation allowance Inventory Adjustments Finite lived intangible asset consisting of trademarks and customer lists. Finite lived FAC gross. Finite lived Med Nap gross. Goodwill And Intangible Assets Disclosure [Abstract] Series of individually immaterial business acquisitions B. First Aid Only, Inc. Series Of Individually Immaterial Business Acquisitions B [Member] Series of individually immaterial business acquisitions A. Pac-Kit Series Of Individually Immaterial Business Acquisitions A [Member] Series of individually immaterial business acquisitions C. Vogel Capital Inc. d/b/a Diamond Machining Technology Series Of Individually Immaterial Business Acquisitions C [Member] The C-Thru Ruler Company Series Of Individually Immaterial Business Acquisitions [Member] Series of individually immaterial business acquisitions D. Spill Magic Series Of Individually Immaterial Business Acquisitions D [Member] Tradename Finite Lived Trade Names Gross Customer List Finite Lived Customer Lists Gross Trademarks Finite Lived Trademarks Gross Non-Compete Finite Lived Noncompete Agreements Gross Slice License Agreement Finite Lived License Agreements Gross Patents Finite Lived Patents Gross Tradename, Customer List Finite Lived Trade Names And Customer Lists Gross FAC Finite Lived F A C Gross Med-Nap Finite Lived Med Nap Gross Subtotal Intangible Assets Gross Excluding Goodwill Accumulated amortization Finite Lived Intangible Assets Accumulated Amortization Intangible Assets Total: Intangible Assets Net Including Goodwill Amortization expense - patents and trademarks Amortization Of Intangible Assets Estimated aggregate amortization expense: Finite Lived Intangible Assets Future Amortization Expense [Abstract] 2021 Finite Lived Intangible Assets Amortization Expense Next Twelve Months 2022 Finite Lived Intangible Assets Amortization Expense Year Two 2023 Finite Lived Intangible Assets Amortization Expense Year Three 2024 Finite Lived Intangible Assets Amortization Expense Year Four 2025 Finite Lived Intangible Assets Amortization Expense Year Five Carrying value as of the balance sheet date of obligations incurred through that date for customer rebates. Customer Rebates Accrued Customer Rebates Pension Liability Defined Benefit Pension Plan Current And Noncurrent Liabilities Accrued Compensation Employee Related Liabilities Current And Noncurrent Dividend Payable Dividends Payable Current And Noncurrent Income Taxes Payable Taxes Payable Current And Noncurrent Other Other Accrued Liabilities Current And Noncurrent Total other accrued liabilities Accrued Liabilities Current And Noncurrent Pension settlement charges Pension Expense Company contributions to plan Pension Contributions Defined Benefit Plan, Plan Assets, Category Defined Benefit Plan By Plan Asset Categories [Axis] Defined Benefit Plan, Plan Assets, Category Plan Asset Categories [Domain] Equity Securities Equity Securities [Member] Fixed Income Securities Fixed Income Funds [Member] Other securities investments. Other Securities/Investments Other Securities Investments [Member] Plan asset weighted average allocation Defined Benefit Plan Weighted Average Asset Allocations Mutual Fund Mutual Fund [Member] Money Market Fund Money Market Funds [Member] Equity Common and Collected Funds Equity Funds [Member] Fixed Income Common and Collected Funds Fair Value Hierarchy and NAV Fair Value By Fair Value Hierarchy Level [Axis] Fair Value Hierarchy and NAV Fair Value Measurements Fair Value Hierarchy [Domain] Level 1 Fair Value Inputs Level1 [Member] Level 2 Fair Value Inputs Level2 [Member] Level 3 Fair Value Inputs Level3 [Member] Pension plan assets Defined Benefit Plan Fair Value Of Plan Assets Assumptions used to determine benefit obligation: Defined Benefit Plan Weighted Average Assumptions Used In Calculating Benefit Obligation [Abstract] Discount rate Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate Changes in benefit obligation: Defined Benefit Plan Change In Benefit Obligation Roll Forward Benefit obligation at beginning of year Defined Benefit Plan Benefit Obligation Interest cost Defined Benefit Plan Interest Cost Service cost Defined Benefit Plan Service Cost Actuarial loss Defined Benefit Plan Actuarial Gain Loss Benefits and plan expenses paid Defined Benefit Plan Benefit Obligation Benefits Paid Curtailments, settlements and special termination benefits Defined Benefit Plan Special Termination Benefits Benefit obligation at end of year: Changes in plan assets: Defined Benefit Plan Change In Fair Value Of Plan Assets Roll Forward Fair value of plan assets at beginning of year Actual return on plan assets Defined Benefit Plan Actual Return On Plan Assets Employer contribution Defined Benefit Plan Contributions By Employer Benefits and plan expenses paid Settlements Defined Benefit Plan Settlements Plan Assets Fair value of plan assets at end of year Funded status: Defined Benefit Plan Funded Status Of Plan Change in net loss recorded in other comprehensive income related to benefit costs. Balance at beginning of the year Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax Change in net loss Defined Benefit Plan Change Net Loss Amortization of actuarial loss Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Loss Net Gain Loss Before Tax Amortization of prior service cost Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Net Prior Service Cost Credit Before Tax Change recognized in other comprehensive income Other Comprehensive Income Loss Finalization Of Pension And Non Pension Postretirement Plan Valuation Before Tax Amounts recognized in accumulated other comprehensive income: Defined Benefit Plan Accumulated Other Comprehensive Income Loss After Tax [Abstract] Net actuarial loss Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses After Tax Prior service cost Defined Benefit Plan Accumulated Other Comprehensive Income Net Prior Service Cost Credit After Tax Total: Total of the non-service components of periodic pension cost. Assumptions used to determine net periodic benefit cost: Defined Benefit Plan Weighted Average Assumptions Used In Calculating Net Periodic Benefit Cost [Abstract] Discount rate Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate Expected return on plan assets Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets Components of net benefit expense: Defined Benefit Plan Net Periodic Benefit Cost [Abstract] Service cost Interest cost Expected return on plan assets Defined Benefit Plan Expected Return On Plan Assets Settlement cost Defined Benefit Plan Recognized Net Gain Loss Due To Settlements1 Amortization of prior service costs Defined Benefit Plan Amortization Of Prior Service Cost Credit Amortization of actuarial loss Defined Benefit Plan Amortization Of Gains Losses Total non-service cost Defined Benefit Plan Net Periodic Benefit Cost Credit Excluding Service Cost Net periodic benefit cost: Defined Benefit Plan Net Periodic Benefit Cost Expected long-term rate of return on plan assets Company contributions to 401k plan Defined Contribution Plan Employer Matching Contribution Percent Employee contributions to profit 401k plan Defined Contribution Plan Maximum Annual Contributions Per Employee Percent Total contribution expense Defined Contribution Plan Cost Recognized Current: Current Income Tax Expense Benefit Continuing Operations [Abstract] Federal Current Federal Tax Expense Benefit State Current State And Local Tax Expense Benefit Foreign Current Foreign Tax Expense Benefit Total Current Current Income Tax Expense Benefit Deferred: Deferred Income Tax Expense Benefit Continuing Operations [Abstract] Federal Deferred Federal Income Tax Expense Benefit State Deferred State And Local Income Tax Expense Benefit Total Deferred Deferred Income Tax Expense Benefit Total Income Tax Expense United States Income Loss From Continuing Operations Before Income Taxes Domestic Foreign Income Loss From Continuing Operations Before Income Taxes Foreign Total Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments Income tax rate charged in foreign jurisdiction. Geographical Statement Geographical [Axis] Geographical Segment Geographical [Domain] Reportable segments D. Hong Kong Reportable Segments D [Member] Hong Kong income tax rate Foreign Income Tax Rate Federal income taxes at 21% statutory rate Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate State and local taxes, net of federal income tax effect Income Tax Reconciliation State And Local Income Taxes Permanent items Income Tax Reconciliation Permanent Items Foreign tax rate difference Income Tax Reconciliation Foreign Income Tax Rate Differential Change in deferred income tax valuation allowance Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance Deferred tax asset representing asset valuations. Deferred income tax liabilities: Components Of Deferred Tax Liabilities [Abstract] Plant, property and equipment Deferred Tax Liabilities Property Plant And Equipment Total Deferred Income Tax Liabilities Deferred income tax assets: Components Of Deferred Tax Assets [Abstract] Asset valuations Deferred Tax Assets Asset Valuations Pension Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions Other Deferred Tax Assets Other Total Deferred Tax Assets Gross Net deferred income tax liability: Deferred Tax Assets Liabilities Net Line of credit facility fee percentage. Debt And Shareholders Equity Long Term Debt And Stockholders Equity [Abstract] Long term debt and stockholders equity. Long term debt and stockholders equity. Long Term Debt And Stockholders Equity [Table] Long Term Debt And Stockholders Equity [Table] HSBC Bank Revolving Credit Facility [Member] First Aid Only Distribution Center Mortgages [Member] Variable Rate Variable Rate [Axis] Variable Rate Variable Rate [Domain] Prime Rate Prime Rate [Member] LIBOR Rate London Interbank Offered Rate L I B O R [Member] Long Term Debt And Stockholders Equity [Line Items] Long Term Debt And Stockholders Equity [Line Items] Credit facility borrowing capacity Line Of Credit Facility Maximum Borrowing Capacity Interest rate Debt Instrument Basis Spread On Variable Rate1 Credit facility interest rate Line Of Credit Facility Interest Rate Description Credit facility expiration date Line Of Credit Facility Expiration Date1 Facility fee per annum Line Of Credit Facility Fee Percentage Covenant terms and compliance Debt Instrument Covenant Compliance Outstanding borrowings under revolving loan agreement Line Of Credit Amount available for borrowing under revolving loan agreement Line Of Credit Facility Remaining Borrowing Capacity Variable rate mortgage interest rate description. Purchase price Business Combination Consideration Transferred1 Area of real estate property Area Of Real Estate Property Variable rate mortgage interest rate Variable Rate Mortgage Interest Rate Description Monthly payment Debt Instrument Periodic Payment Mortgage maturity date Debt Instrument Maturity Date Description 2020 Long Term Debt Maturities Repayments Of Principal In Next Twelve Months 2021 Long Term Debt Maturities Repayments Of Principal In Year Two 2022 Long Term Debt Maturities Repayments Of Principal In Year Three 2023 Long Term Debt Maturities Repayments Of Principal In Year Four 2024 Long Term Debt Maturities Repayments Of Principal In Year Five Thereafter Long Term Debt Maturities Repayments Of Principal After Year Five Shares authorized to be repurchased during period Stock Repurchase Program Number Of Shares Authorized To Be Repurchased Shares authorized to be repurchased during period Shares that may be purchased under repurchase programs Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased Loan received from bank Proceeds From Bank Debt Maturity period Debt Instrument Term Maturity date Debt Instrument Maturity Date Interest rate Debt Instrument Interest Rate Stated Percentage Percentage of debt forgiven for non-payroll costs. Percentage of debt forgiven for non-payroll costs Percentage Of Debt Forgiven For Non Payroll Costs United States UNITED STATES Canada CALIFORNIA Europe Europe [Member] Product and Service Product Or Service [Axis] Product and Service Products And Services [Domain] Product A. Cutting, Sharpening and Measuring Product A [Member] Product B. First Aid and Safety Product B [Member] Canada CANADA Net sales Net sales Revenues Disaggregation By Category Percentage of direct import sales to total net sales. Segment information details narrative. Segment Information Details Narrative [Abstract] Direct import sales to total net sales ratio Direct Import Sales To Total Net Sales Percentage Segments Statement Business Segments [Axis] Segments Segment [Domain] United states segment. United States Segment United States Segment [Member] Canada segment. Canada Segment Canada Segment [Member] Europe segment. Europe Segment Europe Segment [Member] Operating income Assets Additions to property, plant and equipment Property Plant And Equipment Additions Depreciation and amortization Depreciation And Amortization Reconciliation Of Segment Operating Income Reconciliation Of Segment Operating Income Details [Abstract] Interest expense, net Other expense Other Nonoperating Expense Consolidated income before taxes ACU segment revenues details. A C U Segment Revenues Details [Abstract] Reportable segments C. Other International Reportable Segments C [Member] Total international. Total International Total International [Member] Total Revenues Plan Name Plan Name [Axis] Plan Name Plan Name [Domain] Plan name. Employee Plan Plan Name [Member] Plan name A. 2005 Director Plan Plan Name A [Member] Plan name B. 2017 Director Plan Plan Name B [Member] Vesting term Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Rights Shares available for grant Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant Initial grant of an option to purchase set number of shares of common stock. Annual grant of an option to purchase set number of shares of common stock. Shares authorized under plan Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized Shares offered under initial option Share Based Compensation Arrangement By Share Based Payment Award Initial Option Shares offered under annual option Share Based Compensation Arrangement By Share Based Payment Award Annual Option Issue of shares related to settlement of share based compensation. Cash settlement of stock options Shares related to settlement of stock options Issue Of Shares Related To Settlement Of Share Based Compensation Weighted average exercise price per share: Options outstanding at the beginning of the year Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number Options granted Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross Options forfeited Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Options exercised Stock Issued During Period Shares Stock Options Exercised Options outstanding at the end of the year Options exercisable at the end of the year Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number Common stock available for future grants at the end of the year Weighted average exercise price per share: Share Based Compensation Arrangements By Share Based Payment Award Weighted Average Exercise Price Per Share [Abstract] Granted Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price Forfeited Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price Exercised Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price Outstanding Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price Exercisable Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price Exercise Price Range Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range [Axis] Exercise Price Range Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Domain] Exercise price range A. $9.26 to $16.08 Exercise Price Range A [Member] Exercise price range B. $16.09 to $21.35 Exercise Price Range B [Member] Exercise price range C. $21.36 to $22.86 Exercise Price Range C [Member] Exercise price range D. $22.87 to $23.97 Exercise Price Range D [Member] Exercise price range E. $23.98 to $28.20 Exercise Price Range E [Member] Range of exercise prices, lower range Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Lower Range Limit Range of exercise prices, upper range Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Upper Range Limit Number outstanding Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options Options outstanding weighted-average remaining contractual life (years) Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Remaining Contractual Term2 Options outstanding weighted-average exercise price Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price Beginning Balance1 Number exercisable Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Exercisable Options Options exercisable weighted-average exercise price Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Exercisable Options Weighted Average Exercise Price1 Weighted average remaining contractual term Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Expected life in years Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 Interest rate, minimum Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Minimum Interest rate, maximum Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Maximum Volatility, minimum Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Minimum Volatility, maximum Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Maximum Dividend yield Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Range Of Dividends Used Stock-based compensation Allocated Share Based Compensation Expense Unrecognized compensation cost Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options Unrecognized compensation cost recognition period Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 Weighted average fair value at the date of grant Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value Aggregate intrinsic value of outstanding options Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value Aggregate intrinsic value of exercisable options Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 Aggregate intrinsic value of options exercised Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value Weighted average shares outstanding Weighted Average Number Of Shares Outstanding Basic Effect of diluted employee stock options Incremental Common Shares Attributable To Share Based Payment Arrangements Denominator for dilutive earnings per share Weighted Average Number Of Diluted Shares Outstanding Options excluded from earnings per share calculation Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount Foreign Currency Translation Adjustment Accumulated Translation Adjustment [Member] Net Prior Service Credit and Actuarial Losses Accumulated Defined Benefit Plans Adjustment [Member] Revision of Prior Period Restatement [Axis] Revision of Prior Period Restatement [Domain] Revision of Prior Period, Accounting Standards Update, Adjustment Revision Of Prior Period Accounting Standards Update Adjustment [Member] Accumulated other comprehensive income (loss), beginning balance Change in net prior service credit and actuarial losses, net of tax Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax Translation adjustment Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax Accumulated other comprehensive income (loss), ending balance Lessee Lease Description [Table] Lessee Lease Description [Table] Scenario Statement Scenario [Axis] Scenario Scenario Unspecified [Domain] Income statement. Cost of Goods Sold Income Statement [Member] Income statement A. Selling, General and Administrative Expenses Income Statement A [Member] Lessee Lease Description [Line Items] Lessee Lease Description [Line Items] Operating lease expense Operating Lease Expense Leases details. Leases Details [Abstract] Operating lease cost Operating Lease Cost Operating lease - cash flow Operating Lease Payments Weighted-average remaining lease term Operating Lease Weighted Average Remaining Lease Term1 Weighted-average discount rate Operating Lease Weighted Average Discount Rate Percent Future Minimum Lease Payments: Operating Lease Liabilities Payments Due [Abstract] 2021 Lessee Operating Lease Liability Payments Due Next Twelve Months 2022 Lessee Operating Lease Liability Payments Due Year Two 2023 Lessee Operating Lease Liability Payments Due Year Three 2024 Lessee Operating Lease Liability Payments Due Year Four 2025 Lessee Operating Lease Liability Payments Due Year Five Thereafter Lessee Operating Lease Liability Payments Due After Year Five Total future minimum lease payments Lessee Operating Lease Liability Payments Due Less : imputed interest Lessee Operating Lease Liability Undiscounted Excess Amount Less : present value of lease liabilities - current Present value of lease liabilities - non-current Schedule Of Business Acquisitions By Acquisition [Table] Schedule Of Business Acquisitions By Acquisition [Table] Business Acquisition [Line Items] Business Acquisition [Line Items] Assets: Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Assets [Abstract] Inventory Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Inventory Prepaid expense Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Assets Prepaid Expense And Other Assets Land & buildings Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Land And Buildings Equipment Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Equipment Intangible assets Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Intangibles Total assets Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Assets Accounts payable Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Liabilities Accounts Payable Total considerations Business Combination Recognized Identifiable Assets Acquired Goodwill And Liabilities Assumed Net Purchase price Payments To Acquire Businesses Gross Accounts receivable Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Assets Receivables Business acquisition, proforma net income Business Acquisitions Pro Forma Net Income Loss Business acquisition, proforma net sales Business Acquisitions Pro Forma Revenue