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Note 3 - Earnings Per Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2024
Net earnings | $ 114,674 | $ 41,224 | $ 63,318
Deduct preferred stock dividends | 23 | 23 | 23
Undistributed net earnings | 114,651 | 41,201 | 63,295
Earnings attributable to participating preferred shareholders | 116 | 48 | 72
Earnings attributable to common shareholders | $ 114,535 | $ 41,153 | $ 63,223
Weighted average common shares outstanding (in shares) | 6,837 | 6,912 | 7,318
Basic earnings per common share (in dollars per share) | $ 16.75 | $ 5.95 | $ 8.64
Earnings attributable to common shareholders | $ 114,535 | $ 41,153 | $ 63,223
Add dividends on convertible preferred stock | 20 | 20 | 20
Earnings attributable to common stock on a diluted basis | $ 114,555 | $ 41,173 | $ 63,243
Additional shares to be issued under full conversion of preferred stock (in shares) | 67 | 67 | 67
Total shares for diluted (in shares) | 6,904 | 6,979 | 7,385
Diluted earnings per common share (in dollars per share) | $ 16.59 | $ 5.9 | $ 8.56

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