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Note 6 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 73,331    
Share-based Payment Arrangement, Option [Member]      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 1,800,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 3 years 240 days    
Common Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 73,331 74,516  
Nonvested [Member]      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 629,000    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 3 years 80 days    
The 2001 Equity Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     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 1 year    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 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 5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years    
Director Plan 2004 [Member] | Nonqualified Stock Options [Member] | Director [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 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 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 10 years    
The 2006 Equity Incentive Plan [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 5 years    
The 2006 Equity Incentive Plan [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years    
Common Stock [Member] | The 2001 Equity Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 1,800,000    
Common Stock [Member] | Director Plan 2004 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 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 1,800,000    
Common Class B [Member] | The 2001 Equity Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 300,000    
Common Class B [Member] | Director Plan 2004 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 500,000    
Common Class B [Member] | The 2006 Equity Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 300,000