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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
Aug. 10, 2022
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, 2022
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Dec. 08, 2020
Oct. 02, 2020
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant                     7,760,639        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross                     1,367,000 295,000      
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period                     7 years        
Dividends, Total                     $ 0 $ 0      
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount                     1,620        
Share-Based Payment Arrangement, Expense                     2,227 1,424      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value                     996        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value                     $ 996        
Share Price                     $ 2.77       $ 5.98
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value                     $ 491 725      
Gross Proceeds from Stock Options Exercised                     282 210      
Share-Based Payment Arrangement, Expense, Tax Benefit                     $ 208 514      
Common Stock Award [Member]                              
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant                     3,486,565        
Share-Based Payment Arrangement, Option [Member]                              
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition                     1 year 9 months 25 days        
Share-Based Payment Arrangement, Option [Member] | Employees, Directors, and Consultants [Member]                              
Share-Based Payment Arrangement, Expense                     $ 817 $ 294      
Performance Shares [Member]                              
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross                       0      
Performance Shares [Member] | Key Executive [Member]                              
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross             800,000                
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period             7 years                
Share-Based Payment Arrangement, Expense                     209        
Performance Shares [Member] | Management [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 Payment Arrangement, Expense                     $ 0        
Restricted Stock Units (RSUs) [Member]                              
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition                   1 year 2 months 12 days          
Share-Based Payment Arrangement, Expense                 $ 1,410 $ 1,130          
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period                     260,800        
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period                     270,262        
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount                 $ 918 918          
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                   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   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                       3 years 3 years    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period                       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               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     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         10,000,000                 5,000,000  
Share-based Compensation Arrangement by Share-based Payment Award, Proposed Number of Shares Authorized                           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                     4,274,074        
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                     10,000