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Note 8 - Earnings Per Share - Net Income Per Share Computation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Net income $ 4,122 $ (106) $ 5,787 $ 5,688 $ 6,175 $ 6,359 $ 9,802 $ 18,223
Allocation of distributed and undistributed income to unvested restricted stock shareholders (128)     0     (192) (2)
Net income (loss) attributable to common shareholders $ 3,994     $ 5,688     $ 9,610 $ 18,221
Weighted average common shares outstanding – basic (in shares) 22,130     23,721     22,584 23,820
Net income (loss) per share – basic (in dollars per share) $ 0.18     $ 0.24     $ 0.43 $ 0.76
Net income (loss) attributable to common shareholders for basic computation $ 3,994     $ 5,688     $ 9,632 $ 18,221
Weighted average effect of dilutive securities – stock options (in shares) 0     24     6 48
Denominator for diluted earnings per share – adjusted weighted average shares (in shares) 22,130     23,745     22,590 23,868
Net income (loss) per share – diluted (in dollars per share) $ 0.18     $ 0.24     $ 0.43 $ 0.76