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Note 6 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 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)     127,227 101,091
Share-Based Payment Arrangement, Option [Member]        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 1,700,000   $ 1,700,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     2 years 8 months 4 days  
Share-Based Payment Arrangement, Option [Member] | Direct, Selling, General and Administrative Expenses [Member]        
Share-Based Payment Arrangement, Expense 307,000 $ 176,000 $ 564,000 $ 186,000
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 382,000   $ 382,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     3 years 6 months  
Nonvested [Member] | Direct, Selling, General and Administrative Expenses [Member]        
Share-Based Payment Arrangement, Expense $ 54,000   $ 27,000  
Share-Based Payment Arrangement, Expense (Benefit)   $ (37,000)    
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   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   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   1,800,000