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Note 10 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended
Mar. 14, 2017
Aug. 01, 2016
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number     4,495,317   4,663,502
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price     $ 2.15   $ 2.16
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term     4 years 219 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value     $ 1,780,084    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value     1,368,424    
Allocated Share-based Compensation Expense     138,461 $ 464,749  
Share-based Compensation     $ 138,461 $ 464,749  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 0.89 $ 0.71  
Dividends     $ 0 $ 0  
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense     0 0  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized     $ 600,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years 36 days    
Employee Stock Option [Member]          
Allocated Share-based Compensation Expense       $ 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, Options, Nonvested, Weighted Average Grant Date Fair Value   $ 0.81      
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  
Share-based Compensation $ 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     $ 0.93    
Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price     $ 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     2,279,315    
2005 Equity Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number     2,216,002