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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, 2022 | Mar. 31, 2021
Net earnings | $ 51,007 | $ 126,100
Deduct preferred stock dividends | 23 | 23
Undistributed earnings | 50,984 | 126,077
Earnings attributable to participating preferred shareholders | 196 | 493
Earnings attributable to common shareholders | $ 50,788 | $ 125,584
Weighted average common shares outstanding (in shares) | 8,707 | 9,088
Basic earnings per common share (in dollars per share) | $ 5.83 | $ 13.82
Earnings attributable to common shareholders | $ 50,788 | $ 125,584
Add dividends on convertible preferred stock | 20 | 20
Earnings attributable to common stock on a diluted basis | $ 50,808 | $ 125,604
Additional shares to be issued related to the equity compensation plan (in shares) | 4 | 3
Additional shares to be issued under full conversion of preferred stock (in shares) | 67 | 67
Total shares for diluted (in shares) | 8,778 | 9,158
Diluted earnings per share (in dollars per share) | $ 5.79 | $ 13.72

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