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Note 6 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Proceeds from Stock Options Exercised   $ 162,000
Common Stock Options [Member]    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 54,759 51,002
Share-Based Payment Arrangement, Option [Member]    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 1,400,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 3 years 4 months 9 days  
Share-Based Payment Arrangement, Option [Member] | Direct, Selling, General and Administrative Expenses [Member]    
Share-Based Payment Arrangement, Expense $ 257,000 $ 11,000
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 $ 409,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 3 years 9 months  
Nonvested [Member] | Direct, Selling, General and Administrative Expenses [Member]    
Share-Based Payment Arrangement, Expense $ 27,000  
Share-Based Payment Arrangement, Expense (Benefit)   $ (65,000)
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] | 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