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Note 14 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Mar. 20, 2018
Mar. 14, 2017
Aug. 01, 2016
Dec. 31, 2016
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance         3,394,858 4,663,502
Payments of Ordinary Dividends, Common Stock         $ 0 $ 0
Share-based Compensation, Total         584,873 1,116,400
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value         2,404,380  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value         $ 1,890,891  
Share Price         $ 3.06  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value         $ 752,729 72,709
Proceeds from Stock Options Exercised         2,434,888 133,000
Gross Proceeds from Stock Options Exercised           373,288
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense         752,729 72,709
Allocated Share-based Compensation Expense, Total         584,873 $ 1,116,400
Employee Stock Option [Member]            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total         $ 566,512  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition         1 year 182 days  
Performance Shares [Member] | Chief Executive Officer [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     750,000      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     7 years      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Performance Criteria, Maximum Vested Per Year, Number     375,000      
Restricted Stock Units (RSUs) [Member]            
Share-based Compensation, Total         $ 210,176  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         218,330  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         3 years  
Restricted Stock Units (RSUs) [Member] | Director [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Per Person 25,000 25,000   25,000    
Share-based Compensation, Total $ 278,750 $ 197,500        
Restricted Stock Units (RSUs) [Member] | Employees [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         93,330  
Non-employee Stock Option [Member] | Director [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, that Would Have Been Granted in Period       20,000    
2015 Equity Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized         5,000,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance         2,145,905  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant         5,732,213  
2005 Equity Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance         1,467,283  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant         2,119,025