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Note 9 - Net Income (Loss) Per Share Attributable to Common Shareholders - Computed Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Numerator:    
Net income (loss) $ (80) $ 1,872
Change in fair value of in-the-money warrant derivative liabilities (2) (1,247)
Net income (loss) applicable to common shareholders – diluted earnings per share $ (82) $ 625
Basic (in shares) 10,417,609 10,189,012
Effect on dilutive securities:    
Options (in shares) 0 242,699
Warrants (in shares) 13,213 155,017
Preferred Stock (in shares) 0 38,889
Weighted-average shares outstanding for diluted earnings per share (in shares) 10,430,822 10,625,617
Basic net income (loss) per share (in dollars per share) $ (0.01) $ 0.18
Diluted net income (loss) per share (in dollars per share) $ (0.01) $ 0.06