Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Stock-based Compensation (Details Textual)

v3.2.0.727
Note 4 - Stock-based Compensation (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Employee Stock Purchase Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price     $ 10.46 $ 10.46    
Share-based Compensation Arrangement by Share-based Payment Award, Market Price Percentage, Offering Date         85.00%  
Stock Issued During Period, Shares, Employee Stock Purchase Plans     10,119 10,097    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 165,440   165,440   165,440  
Minimum [Member] | Restricted Stock [Member] | Non Employee Directors [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         1 year  
Maximum [Member] | Restricted Stock [Member] | Non Employee Directors [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         10 years  
Restricted Stock [Member] | Non Employee Directors [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         1 year 1 year
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         3,705 1,915
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value         $ 13.48 $ 26.09
Restricted Stock [Member] | Employees [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         10 years 5 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         3,000 10,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value         $ 13.33 $ 16.47
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         6,705  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value         $ 13.41  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross         0 0
Allocated Share-based Compensation Expense $ 280,526 $ 191,136     $ 844,992 $ 565,505
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 4,480,544   $ 4,480,544   $ 4,480,544  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition         9 years 109 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term         1 year 292 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value 3,525,546   3,525,546   $ 3,525,546  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term         1 year 328 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 2,981,443   $ 2,981,443   $ 2,981,443  
Proceeds from Stock Options Exercised         $ 41,688 $ 618,848
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period         42,000 456,850