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Consolidated Statements of Stockholders' Equity - USD ($) | Preferred Stock [Member] Cumulative Preferred Stock [Member] | Preferred Stock [Member] Cumulative Convertible Preferred Stock [Member] | Preferred Stock [Member] Participating Convertible Preferred Stock [Member] | Preferred Stock [Member] | Common Stock [Member] Common Class A [Member] | Common Stock [Member] Common Class B [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Treasury Stock, Common [Member] | AOCI Attributable to Parent [Member] | Retained Earnings [Member] | Cumulative Preferred Stock [Member] | Cumulative Convertible Preferred Stock [Member] | Participating Convertible Preferred Stock [Member] | Common Class A [Member] | Common Class B [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Mar. 31, 2023 |  |  |  | $ 351,000 |  |  | $ 3,049,000 | $ 99,152,000 | $ (168,573,000) | $ (20,488,000) | $ 641,259,000 |  |  |  |  |  | $ 554,750,000
Net earnings |  |  |  | 0 |  |  | 0 | 0 | 0 | 0 | 63,318,000 |  |  |  |  |  | 63,318,000
Cash dividends declared on preferred stock |  |  |  | 0 |  |  | 0 | 0 | 0 | 0 | (23,000) |  |  |  |  |  | (23,000)
Equity incentive program |  |  |  | 0 |  |  | 1,000 | 245,000 | 0 | 0 | 0 |  |  |  |  |  | 246,000
Stock issued for profit sharing plan |  |  |  | 0 |  |  | 0 | 71,000 | 0 | 0 | 0 |  |  |  |  |  | 71,000
Contribution of 401(k) match |  |  |  | 0 |  |  | 0 | 957,000 | 1,496,000 | 0 | 0 |  |  |  |  |  | 2,453,000
Purchase treasury stock |  |  |  | 0 |  |  | 0 | 0 | (33,030,000) | 0 | 0 |  |  |  |  |  | (33,030,000)
Change in pension and postretirement benefits, net of tax expense (benefit) of $7,050, $5,772 and ($1,628), respectively |  |  |  | 0 |  |  | 0 | 0 | 0 | (4,892,000) | 0 |  |  |  |  |  | (4,892,000)
Balance at Mar. 31, 2024 |  |  |  | 351,000 |  |  | 3,050,000 | 100,425,000 | (200,107,000) | (25,380,000) | 704,554,000 |  |  |  |  |  | 582,893,000
Preferred stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  | 200,000 | 807,240 | 8,292 |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,400,429 | 1,659,411 |
Net earnings |  |  |  | 0 |  |  | 0 | 0 | 0 | 0 | 41,224,000 |  |  |  |  |  | 41,224,000
Cash dividends declared on preferred stock |  |  |  | 0 |  |  | 0 | 0 | 0 | 0 | (23,000) | $ (3,000) |  |  |  |  | (23,000)
Equity incentive program |  |  |  | 0 |  |  | 1,000 | 174,000 | 0 | 0 | 0 |  |  |  |  |  | 175,000
Stock issued for profit sharing plan |  |  |  | 0 |  |  | 0 | 6,000 | 0 | 0 | 0 |  |  |  |  |  | 6,000
Contribution of 401(k) match |  |  |  | 0 |  |  | 0 | 1,766,000 | 1,029,000 | 0 | 0 |  |  |  |  |  | 2,795,000
Purchase treasury stock |  |  |  | 0 |  |  | 0 | 0 | (11,591,000) | 0 | 0 |  |  |  |  |  | (11,591,000)
Change in pension and postretirement benefits, net of tax expense (benefit) of $7,050, $5,772 and ($1,628), respectively |  |  |  | 0 |  |  | 0 | 0 | 0 | 17,544,000 | 0 |  |  |  |  |  | 17,544,000
Preferred stock conversion |  |  |  | (5,000) |  |  | 0 | 5,000 | 0 | 0 | 0 |  |  |  |  |  | 0
Balance at Mar. 31, 2025 |  |  |  | 346,000 |  |  | 3,051,000 | 102,376,000 | (210,669,000) | (7,836,000) | 745,755,000 |  |  |  |  |  | 633,023,000
Preferred stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  | 200,000 | 807,240 | 7,891 |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,342,172 | 1,562,163 |
Net earnings |  |  |  | 0 |  |  | 0 | 0 | 0 | 0 | 114,674,000 |  |  |  |  |  | 114,674,000
Cash dividends declared on preferred stock |  |  |  | 0 |  |  | 0 | 0 | 0 | 0 | (23,000) | $ (3,000) |  |  |  |  | (23,181)
Equity incentive program |  |  |  | 0 |  |  | 1,000 | 246,000 | 0 | 0 | 0 |  |  |  |  |  | 247,000
Stock issued for profit sharing plan |  |  |  | 0 |  |  | 0 | 3,000 | 0 | 0 | 0 |  |  |  |  |  | 3,000
Contribution of 401(k) match |  |  |  | 0 |  |  | 0 | 2,502,000 | 689,000 | 0 | 0 |  |  |  |  |  | 3,191,000
Purchase treasury stock |  |  |  | 0 |  |  | 0 | 0 | (16,094,000) | 0 | 0 |  |  |  | $ (16,100,000) |  | (16,094,000)
Change in pension and postretirement benefits, net of tax expense (benefit) of $7,050, $5,772 and ($1,628), respectively |  |  |  | 0 |  |  | 0 | 0 | 0 | 21,209,000 | 0 |  |  |  |  |  | 21,209,000
Preferred stock conversion |  |  |  | (15,000) |  |  | 0 | 15,000 | 0 | 0 | 0 |  |  |  |  |  | 0
Balance at Mar. 31, 2026 | $ 50,000 | $ 202,000 | $ 79,000 | $ 331,000 | $ 2,593,000 | $ 459,000 | $ 3,052,000 | $ 105,142,000 | $ (226,074,000) | $ 13,373,000 | $ 860,406,000 |  |  |  |  |  | $ 756,230,000
Preferred stock, shares authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  | 200,000 | 1,400,000 | 6,602 |  |  |
Common stock, shares authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 | 10,000,000 |
Preferred stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  | 200,000 | 807,240 | 6,602 |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,222,138 | 1,557,926 |

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