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Note 14 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 18 Months Ended
Feb. 07, 2019
Mar. 20, 2018
Mar. 14, 2017
Aug. 01, 2016
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2015
Jun. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance         2,591,242     2,591,242     2,591,242 3,394,858
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance         $ 1.94     $ 1.94     $ 1.94 $ 2.18
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term               3 years 80 days        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value         $ 3,495,052     $ 3,495,052     $ 3,495,052  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value         $ 2,364,061     $ 2,364,061     $ 2,364,061  
Share Price         $ 3.29     $ 3.29     $ 3.29  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value               $ 97,609        
Proceeds from Stock Options Exercised               $ 54,621 $ 1,027,719      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross               0        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period               7 years        
Share-based Payment Arrangement, Expense         $ 257,566 $ 148,813   $ 563,386 433,063      
Share-based Payment Arrangement, Noncash Expense, Total               563,386 433,063      
Payments of Ordinary Dividends, Common Stock               $ 0 0      
Minimum [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance         $ 1.31     $ 1.31     1.31  
Maximum [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance         $ 3.17     $ 3.17     $ 3.17  
Restricted Stock Units (RSUs) [Member]                        
Share-based Payment Arrangement, Expense         $ 124,991 $ 78,252   $ 344,473 $ 197,325      
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                      
Performance Shares [Member]                        
Share-based Payment Arrangement, Expense         101,447              
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 Payment Arrangement, Option [Member]                        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total         $ 575,955     $ 575,955     $ 575,955  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition                     1 year 18 days  
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, Number of Shares Available for Grant         4,739,150     4,739,150     4,739,150  
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         2,174,708     2,174,708     2,174,708  
2005 Equity Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance         691,383     691,383     691,383  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant         1,873,059     1,873,059     1,873,059