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Note 10 - Earnings (Loss) Per Common Share - Computation of Loss Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2025
Mar. 31, 2024
Net income (loss) $ (9,798) $ 8,376 $ (4,327) $ 12,679 $ (1,422) $ 8,352
Common shares used in basic earnings (loss) per share (in shares) 12,792,803   13,343,793   12,772,981 13,297,324
Common share equivalents outstanding related to RSUs (in shares) 0   0   0 174,451
Total weighted average common shares and common share equivalents used in diluted earnings (loss) per share (in shares) 12,792,803   13,343,793   12,772,981 13,471,775
Basic (in dollars per share) $ (0.77)   $ (0.32)   $ (0.11) $ 0.63
Diluted (in dollars per share) $ (0.77)   $ (0.32)   $ (0.11) $ 0.62