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Note 16 - Share-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended 50 Months Ended
Sep. 01, 2021
Mar. 16, 2021
Mar. 10, 2020
Oct. 04, 2019
Aug. 01, 2016
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2020
Jun. 07, 2021
Dec. 08, 2020
Oct. 02, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)             8,232,968              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)             295,000 231,270            
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)             7 years              
Dividends, Total             $ 0 $ 0            
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount             982              
Share-based Payment Arrangement, Expense             1,424 980            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value             $ 6,343 4,610     $ 4,610      
Share Price (in dollars per share)             $ 5.18         $ 5.05   $ 5.98
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value             $ 725 2,578            
Gross Proceeds from Stock Options Exercised             211 1,136            
Share-based Payment Arrangement, Expense, Tax Benefit             514 1,442            
Selling, General and Administrative Expenses [Member]                            
Share-based Payment Arrangement, Expense             $ 1,344 939            
Common Stock Award [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)             5,088,115              
Share-based Payment Arrangement, Option [Member]                            
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)             1 year 10 months 24 days              
Share-based Payment Arrangement, Option [Member] | Employees, Directors, and Consultants [Member]                            
Share-based Payment Arrangement, Expense             $ 294 $ 396            
Performance Shares [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)             0              
Performance Shares [Member] | Key Executive [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)       800,000 750,000                  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)       7 years 7 years                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Performance Criteria, Maximum Vested Per Year, Number (in shares)         375,000                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (in shares)               375,000 187,500          
Share-based Payment Arrangement, Expense       $ 0                    
Performance Shares [Member] | Key Executive [Member] | Selling, General and Administrative Expenses [Member]                            
Share-based Payment Arrangement, Expense                     $ 459      
Restricted Stock Units (RSUs) [Member]                            
Share-based Payment Arrangement, Expense             $ 1,130 $ 584            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)             325,365              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)             228,633              
Restricted Stock Units (RSUs) [Member] | Employees [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)             3 years 3 years 3 years 3 years        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)             145,950 81,270 99,300 93,330        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)                 3 years 3 years        
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture             $ 989 $ 258 $ 248 $ 210        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)           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] | Board of Directors [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 17,500 27,883 30,000                      
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture $ 184 $ 1,100 $ 425                      
2015 Equity Plan [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)   10,000,000                     5,000,000  
Share-based Compensation Arrangement by Share-based Payment Award, Proposed Number of Shares Authorized (in shares)                         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 (in shares)             3,059,853              
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 (in shares)             85,000