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Note 16 - Stockholders' Equity - Summary of Changes in Stockholders' Equity (Details) - USD ($)
 3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Balance $ 50,393,000 $ 65,958,000
Share-based compensation expense $ 420,000 $ 558,000
Issuance of common stock upon exercise of stock options, net (in shares) 20,000 15,000
Issuance of common stock upon exercise of stock options, net $ 32,000 $ 46,000
Stock buyback   (441,000)
Release of obligation to issue commons stock 0 0
Release of obligation to issue commons stock 0 0
Accumulated other comprehensive loss (266,000) 85,000
Accumulated other comprehensive loss 266,000 (85,000)
Net loss (3,507,000) (1,305,000)
Balance $ 47,604,000 $ 64,731,000
Common Stock [Member]    
Balance (in shares) 36,611,240 36,403,833
Balance $ 366,000 $ 364,000
Share-based compensation expense $ 0 $ 0
Issuance of common stock upon exercise of stock options, net (in shares) 20,000 15,000
Issuance of common stock upon exercise of stock options, net $ 0 $ 0
Issuance of common stock upon vesting of restricted stock units (in shares) 12,667  
Stock buyback   $ (1,000)
Release of obligation to issue commons stock (in shares) 69,564 69,564
Release of obligation to issue commons stock $ 1,000 $ 0
Release of obligation to issue commons stock (in shares) 69,564 69,564
Release of obligation to issue commons stock $ 1,000 $ 0
Accumulated other comprehensive loss 0 0
Accumulated other comprehensive loss 0 0
Net loss $ 0 $ 0
Balance (in shares) 36,713,471 36,371,529
Balance $ 367,000 $ 363,000
Additional Paid-in Capital [Member]    
Balance 108,551,000 107,110,000
Share-based compensation expense 420,000 558,000
Issuance of common stock upon exercise of stock options, net 32,000 46,000
Issuance of common stock upon vesting of restricted stock units 0  
Stock buyback   (441,000)
Release of obligation to issue commons stock 0 0
Release of obligation to issue commons stock 0 0
Accumulated other comprehensive loss 0 0
Accumulated other comprehensive loss 0 0
Net loss 0 0
Balance 109,003,000 107,273,000
Retained Earnings [Member]    
Balance (57,366,000) (41,154,000)
Share-based compensation expense 0 0
Issuance of common stock upon exercise of stock options, net 0 0
Stock buyback   0
Release of obligation to issue commons stock 0 0
Release of obligation to issue commons stock 0 0
Accumulated other comprehensive loss 0 0
Accumulated other comprehensive loss 0 0
Net loss (3,507) (1,305,000)
Balance (60,873,000) (42,459,000)
AOCI Attributable to Parent [Member]    
Balance (792,000) 2,000
Share-based compensation expense 0 0
Issuance of common stock upon exercise of stock options, net 0 0
Issuance of common stock upon vesting of restricted stock units 0  
Stock buyback   0
Release of obligation to issue commons stock   0
Release of obligation to issue commons stock   0
Accumulated other comprehensive loss (266,000) 85,000
Accumulated other comprehensive loss 266,000 (85,000)
Net loss   0
Balance $ (526,000) $ (83,000)