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Note 16 - Stockholders' Equity - Summary of Changes in Stockholders' Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2022
Mar. 31, 2021
Balance $ 64,731 $ 65,958 $ 52,657 $ 49,140 $ 65,958 $ 49,140
Share-based compensation expense 737 558 328 182    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)         70,000 86,462
Issuance of common stock upon exercise of stock options, net 124 46 116 54    
Stock buyback (557) (441)        
Release of obligation to issue commons stock   0        
Accumulated other comprehensive loss (1) (85) (78) 469    
Net loss (492) (1,305) 262 (619) $ (1,797) $ (357)
Issuance of common stock upon vesting of restricted stock units (in shares)         243,998 201,560
Issuance of common stock upon vesting of restricted stock units 0   0      
Shares retained for payment of taxes in connection with net share settlement of restricted stock units (70)   (141)      
Balance 64,472 64,731 53,144 52,657 $ 64,472 $ 53,144
Obligation to issue common stock       3,431    
Accumulated other comprehensive income $ (1) $ (85) $ (78) $ 469    
Common Stock [Member]            
Balance (in shares) 36,371,529 36,403,833 33,587,443 33,561,544 36,403,833 33,561,544
Balance $ 363 $ 364 $ 336 $ 336 $ 364 $ 336
Share-based compensation expense $ 0 $ 0 $ 0 $ 0    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) 55,000 15,000 60,563 25,899    
Issuance of common stock upon exercise of stock options, net $ 1 $ 0 $ 1 $ 0    
Stock buyback (in shares)   (116,868)        
Stock buyback (1) $ (1)        
Release of obligation to issue commons stock (in shares)   69,564        
Release of obligation to issue commons stock   $ 0        
Accumulated other comprehensive loss 0 0 0 0    
Net loss $ 0 $ 0 $ 0 $ 0    
Issuance of common stock upon vesting of restricted stock units (in shares) 262,342   223,633      
Issuance of common stock upon vesting of restricted stock units $ 2   $ 2      
Shares retained for payment of taxes in connection with net share settlement of restricted stock units (in shares) (18,344)   (22,073)      
Shares retained for payment of taxes in connection with net share settlement of restricted stock units $ 0   $ 0      
Stock buyback (in shares) (142,442)          
Balance (in shares) 36,528,085 36,371,529 33,849,566 33,587,443 36,528,085 33,849,566
Balance $ 365 $ 363 $ 339 $ 336 $ 365 $ 339
Obligation to issue common stock       0    
Accumulated other comprehensive income 0 0 0 0    
Additional Paid-in Capital [Member]            
Balance 107,273 107,110 94,915 91,248 107,110 91,248
Share-based compensation expense 737 558 328 182    
Issuance of common stock upon exercise of stock options, net 124 46 116 54    
Stock buyback (557) (441)        
Release of obligation to issue commons stock   0        
Accumulated other comprehensive loss 0 0 0 0    
Net loss 0 0 0 0    
Issuance of common stock upon vesting of restricted stock units 0   0      
Shares retained for payment of taxes in connection with net share settlement of restricted stock units (70)   (141)      
Balance 107,507 107,273 95,218 94,915 107,507 95,218
Obligation to issue common stock       3,431    
Accumulated other comprehensive income 0 0 0 0    
Retained Earnings [Member]            
Balance (42,459) (41,154) (42,477) (41,858) (41,154) (41,858)
Share-based compensation expense 0 0 0 0    
Issuance of common stock upon exercise of stock options, net 0 0 0 0    
Stock buyback 0 0        
Release of obligation to issue commons stock   0        
Accumulated other comprehensive loss 0 0 0 0    
Net loss (492) (1,305) 262 (619)    
Issuance of common stock upon vesting of restricted stock units 0   0      
Shares retained for payment of taxes in connection with net share settlement of restricted stock units 0   0      
Balance (42,951) (42,459) (42,215) (42,477) (42,951) (42,215)
Obligation to issue common stock       0    
Accumulated other comprehensive income 0 0 0 0    
AOCI Attributable to Parent [Member]            
Balance (83) 2 219 (250) 2 (250)
Share-based compensation expense 0 0 0 0    
Issuance of common stock upon exercise of stock options, net 0 0 0 0    
Stock buyback 0 0        
Release of obligation to issue commons stock   0        
Accumulated other comprehensive loss (1) (85) (78) 469    
Net loss 0 0 0 0    
Issuance of common stock upon vesting of restricted stock units 0   0      
Shares retained for payment of taxes in connection with net share settlement of restricted stock units 0   0      
Balance (84) (83) 141 219 $ (84) $ 141
Obligation to issue common stock       0    
Accumulated other comprehensive income $ (1) $ (85) $ (78) $ 469