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Note 9 - Share-based Compensation (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Proceeds from Stock Options Exercised $ 446,000 $ 1,734,000 $ 0
Share-based Payment Arrangement, Exercise of Option, Tax Benefit $ 862,000 $ 6,300,000 $ 1,900,000
Common Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) 101,091 70,471 100,615
Share-based Payment Arrangement, Option [Member]      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 1,100,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 2 years 4 months 13 days    
Share-based Payment Arrangement, Option [Member] | Direct, Selling, General and Administrative Expenses [Member]      
Share-based Payment Arrangement, Expense $ 607,000 $ 680,000 $ 934,000
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 $ 436,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 4 years    
Nonvested [Member] | Direct, Selling, General and Administrative Expenses [Member]      
Share-based Payment Arrangement, Expense $ 17,000 23,000 290,000
Restricted Stock [Member]      
Tax Benefit Realized Restricted Stock Vested $ 0 235,000 $ 0
Director Plan 2004 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) 780,330    
Share-based Compensation Arrangement by Share-based Payment Award, Options Grants Cumulative (in shares) 2,219,670    
Director Plan 2004 [Member] | Nonqualified Stock Options [Member] | Director [Member]      
Share Based Compensation, Arrangement By Share Based Payment Award, Options Grant, Amount $ 100,000 $ 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) 806,537    
Share-based Compensation Arrangement by Share-based Payment Award, Options Grants Cumulative (in shares) 993,463    
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 0 6,005
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