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Note 13 - Equity Plans (Details Textual) - USD ($)		1 Months Ended	12 Months Ended
Note 13 - Equity Plans (Details Textual) - USD ($)	Jan. 01, 2020	Jan. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
C-Suite Long-Term Incentive Plan [Member]
Minimum Return on Assets for Performance-Based Incentives			5.00%
Performance-Based Award Cap, Percentage of Grant			150.00%
President and Chief Operating Officer [Member] \| C-Suite Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Amount Per Employee		$ 600,000
Chief Executive Officer [Member] \| C-Suite Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Amount Per Employee		1,100,000
Chief Financial Officer [Member] \| C-Suite Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Amount Per Employee		$ 300,000
Restricted Stock Units (RSUs) [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total			$ 1,300,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition			1 year 2 months 12 days
RSU expense before taxes of the Plan			$ 1,297,000	$ 1,045,000	$ 1,265,000
Restricted Stock Units (RSUs) [Member] \| Senior Management Stock Incentive Program [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period			5 years
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Participant's Base Salary			10.00%
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Amount Per Employee			$ 17,500
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period				0
Restricted Stock Units (RSUs) [Member] \| C-Suite Long-Term Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period			20,000
Restricted Stock Units (RSUs) [Member] \| Non-Employee Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Value			$ 80,000	$ 80,000
Restricted Stock Units (RSUs) [Member] \| Non-Employee Director [Member] \| Share-Based Payment Arrangement, Tranche One [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period			1 year
Restricted Stock Units (RSUs) [Member] \| President and Chief Operating Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period	15,694
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Percentage of Grant Value			150.00%
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total			$ 900,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition			2 years
Performance Shares [Member] \| C-Suite Long-Term Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period			20,000
Minimum Percentage of EBITDA Divided by Average Accounts Receivable, Inventory and Property, Plant and Equipment to Vest		5.00%
Service Based Cash Awards [Member] \| C-Suite Long-Term Incentive Plan [Member]
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount			$ 500,000
Performance-Based Cash Awards [Member] \| C-Suite Long-Term Incentive Plan [Member]
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount			$ 500,000
Phantom Share Units (PSUs) [Member] \| Phantom Stock Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period			3 years
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total			$ 700,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition			2 years
Phantom Share Units (PSUs) [Member] \| Phantom Stock Plan [Member] \| General and Administrative Expense [Member]
RSU expense before taxes of the Plan			$ 300,000
Phantom Share Units (PSUs) [Member] \| Phantom Stock Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Annual Grant Value		$ 30,000
Common Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant			1,400,000