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Consolidated Statements of Stockholders' Equity (Parentheticals) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Cumulative Preferred Stock [Member] |  |
Preferred stock, dividend rate | 6.00% |
Preferred stock, par value (in dollars per share) | $ 0.25 |
Cumulative Convertible Preferred Stock [Member] |  |
Preferred stock, dividend rate | 10.00% |
Preferred stock, par value (in dollars per share) | $ 0.025 |
Participating Convertible Preferred Stock [Member] |  |
Preferred stock, par value (in dollars per share) | 0.025 |
Series 2003 Convertible Preferred Stock [Member] |  |
Preferred stock, par value (in dollars per share) | 0.025 |
Common Class A [Member] |  |
Common stock, par value (in dollars per share) | 0.25 |
Common Class B [Member] |  |
Common stock, par value (in dollars per share) | $ 0.25 |
Accounting Standards Update 2016-02 [Member] |  |
Operating lease impairment adjustment upon the adoption of ASU 2016-02 "Leases", tax |  | $ 673
Operating lease impairment adjustment upon the adoption of ASU 2016-02 "Leases", tax | $ 33,916 | 14,427
Change in pension and postretirement benefits, tax | $ (19,528) | $ 20,312

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