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Note 14 - Share-based Compensation (Details Textual) - USD ($)
6 Months Ended 12 Months Ended
Feb. 07, 2019
Mar. 20, 2018
Mar. 14, 2017
Aug. 01, 2016
Mar. 31, 2019
Mar. 31, 2018
Sep. 30, 2018
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance         2,598,242   3,394,858  
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 259 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value         $ 2,369,242      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value         $ 1,576,690      
Share Price         $ 2.85      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value         $ 34,903      
Proceeds from Stock Options Exercised         $ 45,172 $ 185,718    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross         0      
Share-based Payment Arrangement, Noncash Expense, Total         $ 305,820 $ 284,250    
Payments of Ordinary Dividends, Common Stock         0   $ 0  
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 Payment Arrangement, Noncash Expense, Total         $ 210,176      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         249,300      
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 Payment Arrangement, Noncash Expense, 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      
Restricted Stock Units (RSUs) [Member] | Non-employee Directors [Member]                
Share Based Compensation Arrangement By Share Based Payment Award Options, Annual Grants, Gross 30,000              
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture $ 412,500              
Share-based Payment Arrangement, Option [Member]                
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total         $ 736,226      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition         1 year 229 days      
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      
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         2,214,874      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant         5,345,316      
2005 Equity Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance         694,883      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant         2,435,559