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Note 15 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 10, 2020
Oct. 04, 2019
Feb. 07, 2019
Aug. 01, 2016
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)         2,730,430   2,730,430   2,219,268    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares)             1,133,727 0      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)             7 years        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total         $ 378,436   $ 378,436        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)             2 years 7 days        
Share-based Payment Arrangement, Expense         $ 322,025 $ 257,566 $ 775,642 $ 563,388      
Share-based Payment Arrangement, Noncash Expense, Total             $ 775,642 $ 563,386      
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)             13,063 0      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share)         $ 2.54   $ 2.54   $ 1.94    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)             4 years 182 days        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value         $ 6,327,111   $ 6,327,111        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value         $ 3,292,311   $ 3,292,311        
Share Price (in dollars per share)         $ 4.86   $ 4.86        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value             $ 2,232,469 $ 97,609      
Proceeds from Stock Options Exercised             $ 996,891 54,621      
Minimum [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share)         1.31   $ 1.31        
Maximum [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share)         $ 3.40   $ 3.40        
Restricted Stock Units (RSUs) [Member]                      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total         $ 675,622   $ 675,622        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)             1 year 113 days        
Share-based Payment Arrangement, Expense         136,415 124,991 $ 430,506 344,473      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)             231,270        
Restricted Stock Units (RSUs) [Member] | Employees [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)             3 years   3 years 3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)             81,270   99,300 93,330  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)                   3 years  
Share-based Payment Arrangement, Noncash Expense, Total             $ 257,626   $ 248,250 $ 210,176  
Restricted Stock Units (RSUs) [Member] | Non-employee Directors [Member]                      
Share-based Payment Arrangement, Noncash Expense, Total     $ 412,500                
Share Based Compensation Arrangement By Share Based Payment Award Options, Annual Grants, Gross (in shares)     30,000                
Restricted Stock Units (RSUs) [Member] | Board of Director [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 30,000                    
Share-based Payment Arrangement, Noncash Expense, Total $ 424,500                    
Performance Shares [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)   93,750                  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)   7 years                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)   800,000                  
Share-based Payment Arrangement, Expense         153,873   249,623   $ 151,181    
Performance Shares [Member] | Chief Executive Officer [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)       7 years              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)       750,000              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Performance Criteria, Maximum Vested Per Year, Number (in shares)       375,000              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (in shares)                 187,500    
Share-based Payment Arrangement, Option [Member]                      
Share-based Payment Arrangement, Expense         $ 185,610 $ 124,991 $ 345,136 $ 218,915      
2015 Equity Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)                     5,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)         191,000   191,000        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)         3,637,674   3,637,674        
2015 Equity Plan [Member] | Restricted Stock Units (RSUs) [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance (in shares)         2,842,444   2,842,444        
2005 Equity Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)         604,230   604,230