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Note 16 - Share-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended 50 Months Ended
Mar. 16, 2021
Mar. 10, 2020
Oct. 04, 2019
Aug. 01, 2016
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2020
Dec. 08, 2020
Oct. 02, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)         8,256,302     8,256,302              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)               245,000   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         $ 812     812              
Share-based Payment Arrangement, Expense         $ 328   $ 296 $ 510 $ 454            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share)         $ 3     $ 3   $ 2.56     $ 2.56    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)               4 years 98 days              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value         $ 10,137     $ 10,137              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value         $ 6,742     $ 6,742              
Share Price (in dollars per share)         $ 6.69     $ 6.69             $ 5.98
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value               $ 455 242            
Gross Proceeds from Stock Options Exercised               $ 170 258            
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         $ 309   283 $ 479 427            
Common Stock Award [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)         5,206,915     5,206,915              
Share-based Payment Arrangement, Option [Member]                              
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)               2 years 146 days              
Share-based Payment Arrangement, Option [Member] | Employees, Directors, and Consultations [Member]                              
Share-based Payment Arrangement, Expense         $ 79   128 $ 123 160            
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 259 days              
Share-based Payment Arrangement, Expense         249   $ 168 $ 387 $ 294            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)               246,565              
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount         $ 1,713     $ 1,713              
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)         107,200         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         $ 793         $ 258 $ 248 $ 210      
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)               22,073 13,063            
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) 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)         2,956,887     2,956,887              
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