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Debt Debt Disclosure [Text Block] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Common stock, shares authorized (shares) Common Stock, Shares Authorized Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Stock-Based Compensation Compensation Related Costs, Policy [Policy Text Block] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Total deferred Deferred Income Tax Expense (Benefit), Excluding Provisional Gain Deferred Income Tax Expense (Benefit), Excluding Provisional Gain Entity Central Index Key Entity Central Index Key Beginning Balance, Shares Ending Balance, Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Cost not yet recognized Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Entity Emerging Growth Company Entity Emerging Growth Company Selling, general and administrative expenses Selling, general, and administrative expenses Selling, General and Administrative Expense Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Stock compensation expense Share-based Payment Arrangement, Noncash Expense Short-term lease liability Operating Lease, Liability, Current Schedule of earnings per share, basic and diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Other Increase (Decrease) in Other Operating Assets and Liabilities, Net Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivative Instruments and Hedging Activities Disclosure [Text Block] LONG-TERM DEBT, LESS CURRENT PORTION Long-term Debt, Excluding Current Maturities Long-term Debt, Excluding Current Maturities Derivative [Table] Derivative [Table] Income Taxes Income Tax, Policy [Policy Text Block] Credit Facility [Domain] Credit Facility [Domain] Accrued payroll and employee benefits Employee-related Liabilities, Current Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Income Taxes Income Tax Disclosure [Text Block] Water Treatment [Member] Water Treatment [Member] Water Treatment [Member] Water treatment. 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Incorporation, State or Country Code Buildings and improvements Buildings and Improvements, Gross Income Tax Contingency [Table] Income Tax Contingency [Table] Operating leases Finance Lease, Right-of-Use Asset, Amortization Less accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Award Type [Domain] Award Type [Domain] Fiscal 2024 Operating Leases, Future Minimum Payments, Due in Five Years Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Revolving Credit Facility [Member] Revolving Credit Facility [Member] Prepaid expenses Deferred Tax Liabilities, Prepaid Expenses ESPP shares issued Stock Issued During Period, Value, Employee Stock Purchase Plan Cash dividends paid Payments of Ordinary Dividends, Common Stock Goodwill and Identifiable Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Schedule of Long-term Debt Instruments Schedule of Long-term Debt Instruments [Table Text Block] Total (percent) Effective Income Tax Rate Reconciliation, Percent Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Schedule of provisions for income taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Total liabilities Liabilities Schedule of effective income tax rate reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Common stock; authorized: 30,000,000 shares of $0.05 par value; 10,512,229 and 10,592,450 shares issued and outstanding for 2020 and 2019, respectively Common Stock, Value, Issued Range of restricted stock to be issued minimum Range of Restricted Stock to be Issued Minimum Range of restricted stock to be issued minimum. Deferred Compensation Plan Assets Deferred Compensation Plan Assets Forfeited or expired, Weighted average grant date fair value (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Unrealized loss on interest rate swap Deferred Tax Assets, Unrealized Losses on Trading Securities Shares surrendered for payroll taxes Shares Surrendered During Period, For Payroll Taxes, Value Shares Surrendered During Period, For Payroll Taxes, Value Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Inventories Increase (Decrease) in Inventories Total contribution expense Profit Sharing, Employee Stock Ownership Plan, Employee Stock Purchase Plan and Defined Contribution Pension Plan Contribution Expense Profit Sharing, Employee Stock Ownership Plan, Employee Stock Purchase Plan and Defined Contribution Pension Plan Contribution Expense Cash and cash equivalents CASH AND CASH EQUIVALENTS - beginning of year CASH AND CASH EQUIVALENTS - end of year Cash and Cash Equivalents, at Carrying Value Dilutive impact of stock options, performance units, and restricted stock (shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Payments on senior secured revolving credit facility Repayments of Other Long-term Debt Finished goods (LIFO basis) LIFO Inventory Amount Stock compensation accruals Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Schedule of goodwill Schedule of Goodwill [Table Text Block] Weighted average number of shares outstanding-basic Weighted Average Number of Shares Outstanding, Basic Weighted Average Number of Shares Outstanding, Basic Right-of-use assets Operating Lease, Right-of-Use Asset Equity Components [Axis] Equity Components [Axis] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] DEFERRED INCOME TAXES Net deferred tax liabilities Deferred Tax Liabilities, Net Machinery and equipment Machinery and Equipment, Gross Total shareholders’ equity Stockholders' equity, beginning balance Stockholders' equity, ending balance Stockholders' Equity Attributable to Parent Amortization of Intangible Assets Amortization of Intangible Assets Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability Multi Employer Pension Plan Withdrawal Liability Payment Over Period of Years Multi Employer Pension Plan Withdrawal Liability Payment Over Period of Years Multi employer pension plan withdrawal liability payment over period of years. Land Land Federal — current Current Federal Tax Expense (Benefit) Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] PENSION WITHDRAWAL LIABILITY Liability, Defined Benefit Pension Plan, Noncurrent Qualified Plan [Member] Qualified Plan [Member] Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased Line of Credit Facility, Interest Rate at Period End Line of Credit Facility, Interest Rate at Period End Depreciation and amortization Depreciation, Depletion and Amortization Gross Amount Finite-Lived Intangible Assets, Gross Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Percentage of FIFO inventory Percentage of FIFO Inventory Allowance for doubtful accounts receivable Accounts Receivable, Allowance for Credit Loss Security Exchange Name Security Exchange Name Pension withdrawal liability Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions Stock Repurchase Program, Number of Shares Authorized to be Repurchased Stock Repurchase Program, Number of Shares Authorized to be Repurchased Additional paid-in capital Additional Paid in Capital, Common Stock Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Unrealized gain on interest rate swap Deferred Tax Liabilities, Unrealized Gains on Trading Securities Equity Component [Domain] Equity Component [Domain] Document Transition Report Document Transition Report Interest expense, net Interest Income (Expense), Net Office Equipment [Member] Office Equipment [Member] Lessee, Operating Lease, Option to Extend Lessee, Operating Lease, Option to Extend Total deferred tax assets Deferred Tax Assets, Gross Goodwill Impairment Goodwill Impairment Goodwill, Impairment Loss Intangible assets, Gross Carrying Amount Intangible Assets Gross Carrying Amount Intangible assets gross carrying amount. Fiscal 2022 Operating Leases, Future Minimum Payments, Due in Three Years Shipping and Handling Shipping and Handling Cost, Policy [Policy Text Block] Income Statement [Abstract] Income Statement [Abstract]