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Note 17 - Stockholders' Equity - Summary of Changes in Stockholders' Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Balance $ 49,140 $ 35,381
Share-based compensation expense $ 182 $ 158
Issuance of common stock upon exercise of stock options, net (in shares) 25,899 83,343
Issuance of common stock upon exercise of stock options, net $ 54 $ 144
Obligation to issue common stock 3,431  
Other comprehensive income (loss) 469 85
Net (loss) income (619) 620
Balance $ 52,657 $ 36,388
Common Stock [Member]    
Balance (in shares) 33,561,544 32,949,987
Balance $ 336 $ 330
Share-based compensation expense
Issuance of common stock upon exercise of stock options, net (in shares) 25,899 83,343
Issuance of common stock upon exercise of stock options, net $ 1
Obligation to issue common stock  
Other comprehensive income (loss)
Net (loss) income
Balance (in shares) 33,587,443 33,033,330
Balance $ 336 $ 331
Additional Paid-in Capital [Member]    
Balance 91,248 89,572
Share-based compensation expense 182 158
Issuance of common stock upon exercise of stock options, net 54 144
Obligation to issue common stock 3,431  
Other comprehensive income (loss)
Net (loss) income
Balance 94,915 89,874
Retained Earnings [Member]    
Balance (41,858) (53,732)
Share-based compensation expense
Issuance of common stock upon exercise of stock options, net
Obligation to issue common stock  
Other comprehensive income (loss)
Net (loss) income (619) 620
Balance (42,477) (53,112)
AOCI Attributable to Parent [Member]    
Balance (250) (459)
Share-based compensation expense
Issuance of common stock upon exercise of stock options, net
Obligation to issue common stock  
Other comprehensive income (loss) 469 85
Net (loss) income
Balance $ 219 $ (374)