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Note 13 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Mar. 20, 2018
Mar. 14, 2017
Aug. 01, 2016
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance       4,472,817     4,472,817   4,663,502
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance       $ 2.15     $ 2.15   $ 2.16
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term             3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value       $ 1,242,236     $ 1,242,236    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value       990,806     990,806    
Allocated Share-based Compensation Expense, Total       145,789 $ 177,402   284,250 $ 642,151  
Share-based Compensation, Total             $ 284,250 $ 642,151  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value             $ 0.89 $ 0.71  
Dividends, Total             $ 0 $ 0  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total       900,000     $ 900,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition             1 year 328 days    
Employee Stock Option [Member]                  
Allocated Share-based Compensation Expense, Total             $ 307,324    
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            
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, Option, Nonvested, Weighted Average Exercise Price, Ending Balance     $ 0.81            
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       93,330          
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              
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      
Minimum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance       $ 0.93     $ 0.93    
Maximum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance       $ 3.17     $ 3.17    
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       2,279,315     2,279,315    
2005 Equity Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance       2,193,502     2,193,502