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Note 9 - Share-based Compensation (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Proceeds from Stock Options Exercised $ 0 $ 446,000 $ 1,734,000
Share-Based Payment Arrangement, Exercise of Option, Tax Benefit $ 160,000 $ 862,000 $ 6,300,000
Common Stock Options [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 127,227 101,091 70,471
Share-Based Payment Arrangement, Option [Member]      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 1,200,000    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 2 years 7 months 17 days    
Share-Based Payment Arrangement, Option [Member] | Direct, Selling, General and Administrative Expenses [Member]      
Share-Based Payment Arrangement, Expense $ 1,100,000 $ 607,000 $ 680,000
Nonvested [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 5 years    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 327,000    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 3 years    
Nonvested [Member] | Direct, Selling, General and Administrative Expenses [Member]      
Share-Based Payment Arrangement, Expense $ 109,000 17,000 23,000
Restricted Stock [Member]      
Share-Based Payment Arrangement, Expense $ 0 $ 0  
Tax Benefit Realized Restricted Stock Vested     $ 235,000
Director Plan 2004 [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) 707,862    
Share-based Compensation Arrangement by Share-based Payment Award, Options Grants Cumulative (in shares) 2,292,138    
Director Plan 2004 [Member] | Nonqualified Stock Options [Member] | Director [Member]      
Share Based Compensation, Arrangement By Share Based Payment Award, Options Grant, Amount $ 100,000    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 1 year    
Director Plan 2004 [Member] | Nonqualified Stock Options [Member] | Director [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) 10 years    
Director Plan 2004 [Member] | Nonqualified Stock Options [Member] | Director [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) 3 years    
Director Plan 2004 [Member] | Common Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) 3,000,000    
The 2006 Equity Incentive Plan [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) 751,778    
Share-based Compensation Arrangement by Share-based Payment Award, Options Grants Cumulative (in shares) 1,048,222    
The 2006 Equity Incentive Plan [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) 10 years    
The 2006 Equity Incentive Plan [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) 5 years    
The 2006 Equity Incentive Plan [Member] | Nonvested [Member]      
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)   12,698  
Share-based Compensation Arrangement by Share-based Payment Award, Nonvested Restricted Stock, Outstanding Number (in shares) 12,698    
The 2006 Equity Incentive Plan [Member] | Common Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) 1,800,000