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Consolidated Statements of Stockholders' Equity - USD ($) | Cumulative Preferred Stock [Member] | Cumulative Convertible Preferred Stock [Member] | Participating Convertible Preferred Stock [Member] | Series 2003 Convertible Preferred Stock [Member] | Common Class A [Member] | Common Class B [Member] | Retained Earnings [Member] | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Treasury Stock, Common [Member] | AOCI Attributable to Parent [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Mar. 31, 2020 |  |  |  |  |  |  | $ 459,797,000 | $ 681,000 | $ 3,041,000 | $ 98,384,000 | $ (88,319,000) | $ (79,220,000) |
Net earnings |  |  |  |  |  |  | 126,100,000 | 0 | 0 | 0 | 0 | 0 | $ 126,100,000
Cash dividends paid on preferred stock |  |  |  |  |  |  | (23,000) | 0 | 0 | 0 | 0 | 0 |
Equity incentive program |  |  |  |  |  |  | 0 | 0 | 0 | 100,000 | 0 | 0 |
Contribution of 401(k) match |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 1,479,000 | 0 |
Purchase of treasury stock |  |  |  |  |  |  | 0 | 0 | 0 | 0 | (4,358,000) | 0 |
Preferred stock conversion |  |  |  |  |  |  | 0 | (18,000) | 0 | 18,000 | 0 | 0 |
Change in pension and postretirement benefits adjustment (net of tax) |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0 | 60,153,000 | (60,153,000)
Balance at Mar. 31, 2021 |  |  |  |  |  |  | 585,874,000 | 663,000 | 3,041,000 | 98,502,000 | (91,198,000) | (19,067,000) |
Preferred stock, shares outstanding (in shares) | 200,000 | 807,240 | 33,855 | 500 |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  | 7,353,545 | 1,709,638 |  |  |  |  |  |  |
Net earnings |  |  |  |  |  |  | 51,007,000 | 0 | 0 | 0 | 0 | 0 | 51,007,000
Cash dividends paid on preferred stock |  |  |  |  |  |  | (23,000) | 0 | 0 | 0 | 0 | 0 |
Equity incentive program |  |  |  |  |  |  | 0 | 0 | 0 | 120,000 | 0 | 0 |
Contribution of 401(k) match |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 1,107,000 | 0 |
Purchase of treasury stock |  |  |  |  |  |  | 0 | 0 | 0 | 0 | (38,788,000) | 0 |
Preferred stock conversion |  |  |  |  |  |  | 0 | (19,000) | 0 | 19,000 | 0 | 0 |
Change in pension and postretirement benefits adjustment (net of tax) |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0 | (7,401,000) | 7,401,000
Balance at Mar. 31, 2022 |  |  |  |  |  |  | 636,858,000 | 644,000 | 3,041,000 | 98,641,000 | (128,879,000) | (26,468,000) | 583,837,000
Preferred stock, shares outstanding (in shares) | 200,000 | 807,240 | 32,256 | 500 |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  | 6,627,318 | 1,705,930 |  |  |  |  |  |  |
Net earnings |  |  |  |  |  |  | 33,138,000 | 0 | 0 | 0 | 0 | 0 | 33,138,000
Cash dividends paid on preferred stock | $ (3,000) |  |  |  |  |  | (23,000) | 0 | 0 | 0 | 0 | 0 | (23,000)
Equity incentive program |  |  |  |  |  |  | 0 | 0 | 0 | 150,000 | 0 | 0 |
Contribution of 401(k) match |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 1,515,000 | 0 |
Purchase of treasury stock |  |  |  |  | $ (41,200,000) |  | 0 | 0 | 0 | 0 | (41,209,000) | 0 |
Preferred stock conversion |  |  |  |  |  |  | 0 | (293,000) | 8,000 | 285,000 | 0 | 0 |
Change in pension and postretirement benefits adjustment (net of tax) |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0 | 5,980,000 | (5,980,000)
Stock issued for profit sharing plan |  |  |  |  |  |  |  |  |  | 76,000 |  |  |
Balance at Mar. 31, 2023 |  |  |  |  |  |  | $ 669,973,000 | $ 351,000 | $ 3,049,000 | $ 99,152,000 | $ (168,573,000) | $ (20,488,000) | $ 583,464,000
Preferred stock, shares authorized (in shares) | 200,000 | 1,400,000 | 8,292 | 0 |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | 200,000 |  |  | 0 |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) | 200,000 | 807,240 | 8,292 | 0 | 5,928,424 | 1,707,241 |  |  |  |  |  |  |
Preferred stock, stock amount | $ 50,000 | $ 202,000 | $ 99,000 | $ 0 |  |  |  |  |  |  |  |  |
Common stock, stock amount |  |  |  |  | $ 2,554,000 | $ 495,000 |  |  |  |  |  |  |

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