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Note 10 - Share-based Compensation Plans and Awards (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 14, 2017
Aug. 01, 2016
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number     4,857,002     4,857,002   4,404,002
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price     $ 2.13     $ 2.13   $ 2.18
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term           4 years 146 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value     $ 62,460     $ 62,460    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value     59,379     59,379    
Allocated Share-based Compensation Expense     177,402   $ 160,317 642,151 $ 308,257  
Share-based Compensation           $ 642,151 $ 308,257  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value           $ 0.71 $ 0.62  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized     $ 1,100,000     $ 1,100,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition           1 year 255 days    
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense           $ 0 $ 0  
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            
Share-based Compensation               $ 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        
Minimum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price     $ 0.93     $ 0.93    
Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price     $ 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     2,629,500     2,629,500    
2005 Equity Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number     2,477,502     2,477,502