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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 9 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2022
Jun. 30, 2021
Numerator:                
Net income (loss) $ 403 $ 346 $ 1,872 $ (3,609) $ (556) $ (1,162) $ 2,620 $ (5,327)
Change in fair value of in-the-money warrant derivative liabilities (10)     0     (40) 0
Net income (loss) applicable to common shareholders - diluted earnings per share $ 393     $ (3,609)     $ 2,580 $ (5,327)
Basic (in shares) 10,217,609     5,939,021     10,203,570 5,117,586
Effect of dilutive securities:                
Options (in shares) 0     0     109,020 0
Warrants (in shares) 13,254     0     13,423 0
Preferred stock (in shares) 38,889     0     38,889 0
Weighted-average shares outstanding for diluted earnings per share (in shares) 10,269,752     5,939,021     10,364,902 5,117,586
Basic net income (loss) per share (in dollars per share) $ 0.04     $ (0.61)     $ 0.26 $ (1.04)
Diluted net income (loss) per share (in dollars per share) $ 0.04     $ (0.61)     $ 0.25 $ (1.04)