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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] | Cumulative Effect, Period of Adoption, Adjustment [Member] Preferred Stock [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-in Capital [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Treasury Stock [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] AOCI Attributable to Parent [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member] | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Treasury Stock [Member] | AOCI Attributable to Parent [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Mar. 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  | $ 707,000 | $ 3,038,000 | $ 98,161,000 | $ (69,556,000) | $ (25,067,000) | $ 403,780,000 |
Net earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,747,000 | $ 5,747,000
Cash dividends paid on preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (23,000) |
Equity incentive program |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |
Contribution of 401(k) match |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,773,000 |  |  |
Purchase of treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,957,000) |  |  |
Preferred stock conversion |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 | (1,000) |  |  |  |
Change in pension and postretirement benefits adjustment (net of tax) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,782,000 |  |
Balance (Accounting Standards Update 2016-02 [Member]) at Mar. 31, 2019 |  |  |  |  |  |  |  |  |  |  |  | $ (2,019,000) |  |  |  |  |  |  |
Balance at Mar. 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  | 707,000 | 3,039,000 | 98,260,000 | (75,740,000) | (18,285,000) | 409,504,000 | 417,485,000
Preferred stock, shares outstanding (in shares) | 200,000 | 807,240 | 37,529 | 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  | 7,667,913 | 1,874,861 |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 52,335,000 | 52,335,000
Cash dividends paid on preferred stock | $ (3,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (23,000) | (23,000)
Equity incentive program |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |
Contribution of 401(k) match |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 94,000 |  |  |
Purchase of treasury stock |  |  |  |  | $ (8,800,000) | $ (3,900,000) |  |  |  |  |  |  |  |  |  | (12,673,000) |  |  |
Preferred stock conversion |  |  |  |  |  |  |  |  |  |  |  |  | (26,000) | 2,000 | 24,000 |  |  |  |
Change in pension and postretirement benefits adjustment (net of tax) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (60,935,000) |  |
Balance at Mar. 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  | $ 681,000 | $ 3,041,000 | $ 98,384,000 | $ (88,319,000) | $ (79,220,000) | $ 459,797,000 | $ 394,364,000
Preferred stock, shares authorized (in shares) | 200,000 | 1,400,000 | 35,355 | 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  | 20,000,000 | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | 200,000 | 807,240 | 35,355 | 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  | 7,383,993 | 1,733,902 |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, stock amount | $ 50,000 | $ 202,000 | $ 421,000 | $ 8,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, stock amount |  |  |  |  | $ 2,539,000 | $ 502,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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