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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, 2018
Dec. 31, 2017
Sep. 30, 2018
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance       2,639,924   3,394,858  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       0      
Share-based Compensation, Total       $ 133,845 $ 138,461    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance       $ 1.94   $ 2.18  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term       3 years 328 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value       $ 1,313,333      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value       $ 1,089,894      
Share Price       $ 2.52      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value       $ 1,504      
Proceeds from Stock Options Exercised       $ 2,528 $ 159,518    
Minimum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance       $ 0.93      
Maximum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance       $ 3.17      
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, Total       $ 397,670      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       1 year 146 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            
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          
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  
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       2,140,971      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       4,980,613      
2005 Equity Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance       717,283      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       2,122,359