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Note 12 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Mar. 14, 2017
Aug. 01, 2016
Dec. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number       4,663,502 4,404,002
Allocated Share-based Compensation Expense       $ 1,116,400 $ 605,426
Payments of Ordinary Dividends, Common Stock       0 954,650
Share-based Compensation       1,116,400 605,426
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value       869,955  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value       $ 673,225  
Share Price       $ 2.13  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value       $ 72,709 288
Proceeds from Stock Options Exercised       373,228 2,200
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense       $ 72,709 288
Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period       7 years  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized       $ 683,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       2 years 73 days  
Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       0  
Performance Shares [Member] | Chief Executive Officer [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   7 years      
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, Options, Performance Criteria, Maximum Vested Per Year, Number   375,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number   187,500      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value   $ 0.81      
Share-based Compensation       $ 42,363 $ 4,774
Restricted Stock Units (RSUs) [Member] | Director [Member]          
Share-based Compensation $ 197,500        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Per Person 25,000   25,000    
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       2,411,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       7,119,169  
2005 Equity Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number       2,377,502  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       2,330,667