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Note 15 - Share-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Nov. 01, 2023
Mar. 20, 2023
Mar. 14, 2023
Feb. 14, 2023
Nov. 01, 2022
Oct. 08, 2022
Aug. 10, 2022
Nov. 01, 2021
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2023
Sep. 30, 2021
Mar. 16, 2021
Dec. 08, 2020
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant                 6,449,196          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross                 887,250          
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period                 7 years          
Dividends                 $ 0   $ 0      
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount                 $ 2,154          
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition                 2 years 4 months 24 days          
Share-Based Payment Arrangement, Expense                 $ 446 $ 420        
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit                 $ 1.51          
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                 5 years 6 months          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value                 $ 322          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value                 $ 29          
Share Price                 $ 2.03          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value                 $ 0 23        
Gross Proceeds from Stock Options Exercised                 $ 0 32        
Vesting Based on Market Conditions [Member]                            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross                 1,204,000          
Common Stock Award [Member]                            
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant                 2,302,827          
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         7 years              
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted                 0          
Share-Based Payment Arrangement, Expense                 $ 62          
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 1 month 6 days          
Share-Based Payment Arrangement, Expense                 $ 228 198        
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period                 10,000          
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount                 $ 666          
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, Expiration Period           7 years                
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 $ 17                          
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               10,000       145,950    
Shares Granted, Value, Share-Based Payment Arrangement, before Forfeiture               $ 51       $ 989    
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       145,600                    
Shares Granted, Value, Share-Based Payment Arrangement, before Forfeiture       $ 582                    
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         $ 29                  
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                      
Share-Based Payment Arrangement, Option [Member] | Employees, Directors, and Consultants [Member]                            
Share-Based Payment Arrangement, Expense                 $ 218 $ 222        
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                 4,146,369