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Note 15 - Share-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 10, 2020
Oct. 04, 2019
Feb. 07, 2019
Aug. 01, 2016
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)         2,659,305 2,219,268    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares)         1,133,727 0    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)         7 years      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total         $ 651      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)         1 year 229 days      
Share-based Payment Arrangement, Expense         $ 980 $ 735    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value         9,551      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value         $ 4,575      
Share Price (in dollars per share)         $ 6.15      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value         $ 2,578 638    
Gross Proceeds from Stock Options Exercised         1,136 757    
Share-based Payment Arrangement, Expense, Tax Benefit         1,442 638    
Restricted Stock Units (RSUs) [Member]                
Share-based Payment Arrangement, Expense         $ 584 $ 471    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)         231,270      
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  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)         81,270 99,300 93,330  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)             3 years  
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture         $ 258 $ 248 $ 210  
Restricted Stock Units (RSUs) [Member] | Non-employee Directors [Member]                
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture     $ 413          
Share Based Compensation Arrangement By Share Based Payment Award Options, Annual Grants, Gross (in shares)     30,000          
Restricted Stock Units (RSUs) [Member] | Board of Director [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 30,000              
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture $ 425              
Performance Shares [Member]                
Share-based Payment Arrangement, Expense         308      
Performance Shares [Member] | Chief Executive Officer [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)   93,750            
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)       7 years        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)       750,000        
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)           187,500    
Share-based Payment Arrangement, Expense         268 $ 151    
Performance Shares [Member] | Key Executive [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)   7 years            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)   800,000            
Share-based Payment Arrangement, Expense   $ 0            
Share-based Payment Arrangement, Option [Member] | Employees, Directors, and Consultations [Member]                
Share-based Payment Arrangement, Expense         $ 396 $ 264    
2015 Equity Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)               5,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)         140,000      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)         3,566,674      
2015 Equity Plan [Member] | Restricted Stock Units (RSUs) [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance (in shares)         2,822,319      
2005 Equity Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)         604,355