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Note 5 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2015
Proceeds from Stock Options Exercised $ 538,000 $ 0 $ 538,000      
Share-based Payment Arrangement, Option [Member]            
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total 2,100,000   $ 2,100,000      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     3 years 2 months 12 days      
Share-based Payment Arrangement, Option [Member] | Direct Fixed and Selling, General and Administrative Expense [Member]            
Share-based Payment Arrangement, Expense 216,000 235,000 $ 498,000 $ 464,000    
Common Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)     70,471 100,615    
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 187,000   $ 187,000      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     3 years 18 days      
Nonvested [Member] | Direct Fixed and Selling, General and Administrative Expense [Member]            
Share-based Payment Arrangement, Expense $ (75,000) $ 73,000 $ (26,000) $ 145,000    
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)     34,622      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)     6,793      
The 2001 Equity Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)           0
The 2001 Equity Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member] | Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)     1 year      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)     5 years      
The 2001 Equity Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)     5 years      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)     10 years      
Director Plan 2004 [Member] | Nonqualified Stock Options [Member] | Director [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)     1 year      
Share Based Compensation Arrangement By Share Based Payment Award, Award Annual Options Grant Amount         $ 100,000  
Director Plan 2004 [Member] | Nonqualified Stock Options [Member] | Minimum [Member] | Director [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)     3 years      
Director Plan 2004 [Member] | Nonqualified Stock Options [Member] | Maximum [Member] | Director [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] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)     10 years      
The 2006 Equity Incentive Plan [Member] | Nonvested [Member]            
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)     0 6,005    
Share-based Compensation Arrangement by Share-based Payment Award, Nonvested Restricted Stock, Outstanding Number (in shares) 42,761   42,761      
Common Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)     34,622      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)     6,793      
Common Stock [Member] | The 2001 Equity Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) 1,800,000   1,800,000      
Common Stock [Member] | Director Plan 2004 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) 3,000,000   3,000,000      
Common Stock [Member] | The 2006 Equity Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) 1,800,000   1,800,000