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Note 15 - Share-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 20, 2023
Mar. 14, 2023
Feb. 14, 2023
Nov. 01, 2022
Oct. 08, 2022
Aug. 10, 2022
Mar. 15, 2022
Nov. 01, 2021
Oct. 04, 2019
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Mar. 16, 2021
Dec. 08, 2020
Oct. 02, 2020
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant                   6,459,196            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross                   1,907,500 1,367,000          
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                   1,638            
Share-Based Payment Arrangement, Expense                     1,642 $ 2,227        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value                   $ 35            
Share Price                   $ 2,010.00           $ 5.98
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value                   $ 2,980 491          
Gross Proceeds from Stock Options Exercised                   138 282          
Share-Based Payment Arrangement, Expense, Tax Benefit                   $ 815 208          
Common Stock Award [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant                   3,175,077            
Share-Based Payment Arrangement, Option [Member]                                
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition                   2 years 3 months 25 days            
Share-Based Payment Arrangement, Option [Member] | Employees, Directors, and Consultants [Member]                                
Share-Based Payment Arrangement, Expense                   $ 656 817          
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 450,000         750,000                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period           7 years                    
Share-Based Payment Arrangement, Expense                   $ 7 0          
Performance Shares [Member] | Management [Member] | Vesting Based on Market Conditions [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted 225,000                              
Restricted Stock Units (RSUs) [Member]                                
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition                   1 year 3 months 18 days            
Share-Based Payment Arrangement, Expense                   $ 986 $ 1,410          
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period                   295,600            
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount                   $ 933            
Restricted Stock Units (RSUs) [Member] | Share-Based Payment Arrangement, Employee [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, Non-Option Equity Instruments, Granted       10,000                        
Shares Granted, Value, Share-Based Payment Arrangement, before Forfeiture               $ 29                
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         145,950 81,270      
Shares Granted, Value, Share-Based Payment Arrangement, before Forfeiture             $ 407         $ 989 $ 258      
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                
Restricted Stock Units (RSUs) [Member] | Non-employee Directors [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted   30,000                            
Shares Granted, Value, Share-Based Payment Arrangement, before Forfeiture   $ 417                            
Restricted Stock Units (RSUs) [Member] | Employees [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period     145,600                          
Shares Granted, Value, Share-Based Payment Arrangement, before Forfeiture     $ 582                          
Restricted Stock Units (RSUs) [Member] | Employees [Member] | Vests Immediately [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted 20,000,000                              
Shares Granted, Value, Share-Based Payment Arrangement, before Forfeiture $ 66                              
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                   3,284,119