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Note 16 - Share-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended 50 Months Ended
Mar. 16, 2021
Mar. 10, 2020
Oct. 04, 2019
Aug. 01, 2016
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2020
Jun. 07, 2021
Dec. 08, 2020
Oct. 02, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)         8,251,302   8,251,302                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)             275,000 1,133,727              
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)             7 years                
Dividends, Total             $ 0   $ 0            
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount         $ 787   787                
Share-based Payment Arrangement, Expense         $ 446 $ 322 $ 956 $ 776              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share)         $ 3.00   $ 3.00   $ 2.56     $ 2.56      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)             4 years 25 days                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value         $ 7,150   $ 7,150                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value         $ 5,049   $ 5,049                
Share Price (in dollars per share)         $ 5.48   $ 5.48           $ 5.05   $ 5.98
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value             $ 455 1,236              
Gross Proceeds from Stock Options Exercised             170                
Proceeds from Stock Options Exercised             $ 170 996              
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)         $ 8.03   $ 8.03                
Selling, General and Administrative Expenses [Member]                              
Share-based Payment Arrangement, Expense         $ 424 311 $ 904 738              
Common Stock Award [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)         5,143,165   5,143,165                
Share-based Payment Arrangement, Option [Member]                              
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)             2 years 1 month 6 days                
Share-based Payment Arrangement, Option [Member] | Employees, Directors, and Consultants [Member]                              
Share-based Payment Arrangement, Expense         $ 84 186 $ 206 345              
Performance Shares [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)             0                
Performance Shares [Member] | Key Executive [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)     800,000 750,000                      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)     7 years 7 years                      
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)                 375,000 187,500          
Share-based Payment Arrangement, Expense     $ 0                        
Performance Shares [Member] | Key Executive [Member] | Selling, General and Administrative Expenses [Member]                              
Share-based Payment Arrangement, Expense                       $ 459      
Restricted Stock Units (RSUs) [Member]                              
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)             1 year 7 months 9 days                
Share-based Payment Arrangement, Expense         363 $ 136 $ 750 $ 431              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)             290,315                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)             228,633                
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount         $ 1,534   $ 1,534                
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 3 years        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)             145,950   81,270 99,300 93,330        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)                   3 years 3 years        
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture             $ 989   $ 258 $ 248 $ 210        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)         5,000                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value         $ 25                    
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)             22,073 13,063              
Restricted Stock Units (RSUs) [Member] | Board of Directors [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 27,883 30,000                          
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture $ 1,100 $ 425                          
2015 Equity Plan [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) 10,000,000                         5,000,000  
Share-based Compensation Arrangement by Share-based Payment Award, Proposed Number of Shares Authorized (in shares)                           10,000,000  
2015 Equity Plan [Member] | Options and RSUs [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award, Options and Equity Instruments Other than Options, Outstanding, Number (in shares)         3,015,637   3,015,637                
2005 Equity Plan [Member] | Options and RSUs [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award, Options and Equity Instruments Other than Options, Outstanding, Number (in shares)         92,500   92,500