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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, 2023
Dec. 31, 2022
Numerator:    
Net loss – basic earnings per share $ (622) $ (80)
Effect of dilutive securities: (in shares) 0 0
Change in fair value of in-the-money warrant derivative liabilities $ 0 $ (2)
Net income (loss) applicable to common shareholders - diluted earnings per share $ (622) $ (82)
Basic (in shares) 10,417,609 10,417,609
Options (in shares) 0 0
Warrants (in shares) 0 13,213
Preferred stock (in shares) 0 0
Weighted-average shares outstanding for diluted earnings per share (in shares) 10,417,609 10,430,822
Basic net loss per share (in dollars per share) $ (0.06) $ (0.01)
Diluted net loss per share (in dollars per share) $ (0.06) $ (0.01)