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Note 14 - Share-based Compensation (Details Textual) - USD ($)
12 Months Ended 21 Months Ended
Feb. 07, 2019
Mar. 20, 2018
Mar. 14, 2017
Aug. 01, 2016
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance         2,219,268 3,394,858 2,219,268
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total         0    
Payments of Ordinary Dividends, Common Stock         $ 0 $ 0  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period         7 years    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total         $ 415,449   $ 415,449
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition         1 year 109 days    
Share-based Payment Arrangement, Expense         $ 735,003 584,873  
Share-based Payment Arrangement, Noncash Expense, Total         735,003 584,873  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value         3,107,958   3,107,958
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value         $ 1,985,062   $ 1,985,062
Share Price         $ 3.35   $ 3.35
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value         $ 638,140 752,729  
Gross Proceeds from Stock Options Exercised         756,513 2,434,887  
Proceeds from Stock Options Exercised         703,313 2,434,888  
Share-based Payment Arrangement, Expense, Tax Benefit         $ 638,140 752,729  
Performance Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross         0    
Share-based Payment Arrangement, Expense         $ 128,025    
Performance Shares [Member] | Chief Executive Officer [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period       7 years      
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, Options, Performance Criteria, Maximum Vested Per Year, Number       375,000      
Restricted Stock Units (RSUs) [Member]              
Share-based Payment Arrangement, Expense         470,857 276,438  
Share-based Payment Arrangement, Noncash Expense, Total         $ 248,250 $ 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 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         99,300 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] | Employees, Directors, and Consultations [Member]              
Share-based Payment Arrangement, Expense         $ 264,146 $ 308,435  
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         1,994,623   1,994,623
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant         4,368,281   4,368,281
2005 Equity Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance         499,494   499,494
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant         1,874,164   1,874,164