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Note 15 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Nov. 01, 2022
Oct. 08, 2022
Aug. 10, 2022
Mar. 15, 2022
Nov. 01, 2021
Oct. 04, 2019
Dec. 31, 2022
Dec. 31, 2021
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             7,732,638            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross             1,204,000 267,000          
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             $ 1,926,000            
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition             2 years 4 months 24 days            
Share-Based Payment Arrangement, Expense             $ 420,000 $ 558,000          
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             3 years 1 month 6 days            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value             $ 3,745,000            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value             $ 2,192,000            
Share Price             $ 3.70           $ 5.98
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value             $ 23 $ 74,000          
Gross Proceeds from Stock Options Exercised             $ 32,000 46,000          
Common Stock Award [Member]                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant             2,582,927            
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             $ 209,000            
Performance Shares [Member] | Management [Member]                          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross     750,000                    
Restricted Stock Units (RSUs) [Member]                          
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition             1 year            
Share-Based Payment Arrangement, Expense             $ 198,000 437,000          
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             $ 723,000            
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                      
Shares Granted, Value, Share-Based Payment Arrangement, before Forfeiture         $ 29,000                
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted 10,000                        
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                
Share-Based Payment Arrangement, Option [Member] | Employees, Directors, and Consultants [Member]                          
Share-Based Payment Arrangement, Expense             $ 222,000 $ 121,000          
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             5,149,711            
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             5,000