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Note 6 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Sep. 30, 2018
Common Class A Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     116,276
The 2001 Equity Incentive Plan [Member] | Employee Stock 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] | Employee Stock 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 Class B [Member]      
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost $ 331,000 $ 331,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross    
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
Common Class A [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     116,276
Common Class A [Member] | Employee Stock Option [Member]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total     $ 1,400,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years 343 days
Common Class A [Member] | Nonvested [Member]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total     $ 532,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years 270 days
Common Class A [Member] | The 2001 Equity Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized     1,800,000
Common Class A [Member] | Director Plan 2004 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized     3,000,000
Common Class A [Member] | The 2006 Equity Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized     1,800,000