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Note 15 - Share-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 15 Months Ended
Mar. 15, 2022
Nov. 01, 2021
Sep. 01, 2021
Mar. 16, 2021
Mar. 10, 2020
Oct. 04, 2019
Jun. 30, 2021
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2021
Dec. 08, 2020
Oct. 02, 2020
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)               7,885,626   7,885,626            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                   302,000 245,000          
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               $ 1,114   1,114            
Share-based Payment Arrangement, Expense               $ 737 $ 328 $ 1,295 $ 510          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share)               $ 3.23   $ 3.23   $ 3.02        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)                   3 years 8 months 19 days            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value               $ 1,067   $ 1,067            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value               $ 1,067   $ 1,067            
Share Price (in dollars per share)               $ 2.75   $ 2.75           $ 5.98
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value                   $ 86 455          
Gross Proceeds from Stock Options Exercised                   $ 170 170          
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    
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    
Common Stock Award [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)               4,525,315   4,525,315            
Share-Based Payment Arrangement, Option [Member]                                
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)                   1 year 7 months 6 days            
Share-Based Payment Arrangement, Option [Member] | Employees, Directors, and Consultants [Member]                                
Share-based Payment Arrangement, Expense               $ 151 79 $ 272 $ 123          
Performance Shares [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                   0 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                    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)           7 years                    
Share-based Payment Arrangement, Expense           $ 0                    
Restricted Stock Units (RSUs) [Member]                                
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)                   1 year 8 months 4 days            
Share-based Payment Arrangement, Expense               586 $ 249 $ 1,023 $ 387          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)                   260,800            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)                   262,342            
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount               $ 1,181   $ 1,181            
Restricted Stock Units (RSUs) [Member] | Share-Based Payment Arrangement, Employee [Member]                                
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture                   $ 348            
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted (in shares)                   100,800            
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) 30,000   17,500 27,883 30,000                      
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture $ 407   $ 184 $ 1,100 $ 425                      
Restricted Stock Units (RSUs) [Member] | Employees [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)                       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      
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture                       $ 989 $ 258      
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                  
Restricted Stock Units (RSUs) [Member] | Non-employee Advisors [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   10,000                            
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture   $ 51                            
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)               3,300,311   3,300,311            
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)               60,000   60,000