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Note 16 - Share-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended 50 Months Ended
Oct. 04, 2019
Feb. 07, 2019
Aug. 01, 2016
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2015
Sep. 30, 2020
Oct. 02, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)       3,540,498              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)       215,000   1,133,727          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)       7 years              
Dividends, Total       $ 0   $ 0          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total       $ 1,067              
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       2 years 219 days              
Share-based Payment Arrangement, Expense       $ 182 $ 158            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share)       $ 2.92   $ 2.56       $ 2.56  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)       4 years 153 days              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value       $ 9,993              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value       $ 6,670              
Share Price (in dollars per share)       $ 6.52             $ 5.98
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value       $ 113 128            
Gross Proceeds from Stock Options Exercised       $ 54 144            
Minimum [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share)       $ 1.31              
Maximum [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share)       $ 6.87              
Selling, General and Administrative Expenses [Member]                      
Share-based Payment Arrangement, Expense       $ 171 143            
Common Stock Award [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)       483,480              
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       $ 138 126            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)       0              
Restricted Stock Units (RSUs) [Member] | Employees [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)             3 years 3 years      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)             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             $ 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                  
Share-based Payment Arrangement, Option [Member] | Employees, Directors, and Consultations [Member]                      
Share-based Payment Arrangement, Expense       $ 44 $ 32            
2015 Equity Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)                 5,000,000    
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)       2,942,018              
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)       115,000