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Note 15 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 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
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
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                   7,441,112   7,441,112              
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross                       1,806,500 302,000            
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period                       7 years              
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount                   $ 1,976,000   $ 1,976,000              
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition                       2 years 4 months 24 days              
Share-Based Payment Arrangement, Expense                   513,000 $ 737,000 $ 933,000 $ 1,295,000            
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit                       $ 1.31              
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit                       $ 8.03              
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term                       4 years 4 months 20 days              
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value                   1,381,000   $ 1,381,000              
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value                   $ 1,095,000   $ 1,095,000              
Share Price                   $ 2.95   $ 2.95             $ 5.98
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value                       $ 147 86,000            
Gross Proceeds from Stock Options Exercised                       $ 86,000 170,000            
Vesting Based on Market Conditions [Member]                                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross                       225,000              
Common Stock Award [Member]                                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant                   2,861,077   2,861,077              
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                       $ 0   $ 209,000          
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 Payment Arrangement, Expense                       $ 400              
Performance Shares [Member] | Vesting Based on Market Conditions [Member] | Management [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 9 months 18 days              
Share-Based Payment Arrangement, Expense                   $ 350,000 586,000 $ 548,000 1,023,000            
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                   1,473,000   $ 1,473,000              
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               $ 29,000                      
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             $ 407,000               $ 989,000 $ 258,000      
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               $ 51,000                      
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   $ 417,000                                  
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     $ 582,000                                
Restricted Stock Units (RSUs) [Member] | Vests Immediately [Member] | Employees [Member]                                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted 20,000                                    
Shares Granted, Value, Share-Based Payment Arrangement, before Forfeiture $ 66,000                                    
Share-Based Payment Arrangement, Option [Member] | Employees, Directors, and Consultants [Member]                                      
Share-Based Payment Arrangement, Expense                   $ 163,000 $ 385,000 $ 151,000 $ 272,000            
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                   4,579,035   4,579,035              
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                   1,000   1,000