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Note 1 - Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Continuing operations earnings | $ 126,100 | $ 51,188
Deduct preferred stock dividends | 23 | 23
Undistributed earnings | 126,077 | 51,165
Earnings attributable to participating preferred shareholders | 493 | 206
Earnings attributable to common shareholders | $ 125,584 | $ 50,959
Weighted average common shares outstanding (in shares) | 9,088 | 9,264
Basic earnings from continuing operations per common share (in dollars per share) | $ 13.82 | $ 5.50
Earnings attributable to common shareholders | $ 125,584 | $ 50,959
Add dividends on convertible preferred stock | 20 | 20
Earnings attributable to common stock on a diluted basis | $ 125,604 | $ 50,979
Additional shares to be issued related to the equity compensation plan (in shares) | 3 | 2
Additional shares to be issued under full conversion of preferred stock (in shares) | 67 | 67
Total shares for diluted (in shares) | 9,158 | 9,333
Diluted earnings from continuing operations per share (in dollars per share) | $ 13.72 | $ 5.46
Discontinued operations earnings | $ 0 | $ 1,147
Deduct preferred stock dividends | 0 | 23
Undistributed earnings | 0 | 1,124
Earnings attributable to participating preferred shareholders | 0 | 5
Earnings attributable to common shareholders | $ 0 | $ 1,119
Weighted average common shares outstanding (in shares) | 0 | 9,264
Basic earnings from discontinued operations per common share (in dollars per share) | $ 0 | $ 0.12
Earnings attributable to common shareholders | $ 0 | $ 1,119
Add dividends on convertible preferred stock | 0 | 20
Earnings attributable to common stock on a diluted basis | $ 0 | $ 1,139
Weighted average common shares outstanding-basic (in shares) | 0 | 9,264
Additional shares to be issued related to the equity compensation plan (in shares) |  | 2
Additional shares to be issued under full conversion of preferred stock (in shares) | 0 | 67
Total shares for diluted (in shares) | 0 | 9,333
Diluted earnings from discontinued operations per share (in dollars per share) | $ 0 | $ 0.12

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- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities, and addition from assumption of issuance of common shares for dilutive potential common shares; of income (loss) from discontinued operations available to common shareholders. + References No definition available. + Details
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