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Note 6 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Proceeds from Stock Options Exercised $ 0 $ 538,000 $ 162,000 $ 538,000  
Common Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)     101,091 70,471  
Share-based Payment Arrangement, Option [Member]          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total 1,800,000   $ 1,800,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     2 years 5 months 1 day    
Share-based Payment Arrangement, Option [Member] | Direct Fixed and Selling, General and Administrative Expense [Member]          
Share-based Payment Arrangement, Expense 176,000 216,000 $ 186,000 $ 498,000  
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 491,000   $ 491,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     4 years 6 months 7 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)     6,005    
Nonvested [Member] | Direct Fixed and Selling, General and Administrative Expense [Member]          
Share-based Payment Arrangement, Expense $ 27,000 $ (75,000) $ (37,000) $ (26,000)  
Common Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)     6,005    
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   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 0  
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