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Consolidated Statements of Stockholders' Equity (Parentheticals) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
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 |
Retained Earnings [Member] | Accounting Standards Update 2016-02 [Member] |  |
Operating lease impairment adjustment upon the adoption of ASU 2016-02 "Leases", tax | $ 673 |
Retained Earnings [Member] |  |
Change in pension and postretirement benefits, tax | 20,312 | $ 2,249
Change in pension and postretirement benefits, tax | 20,312 | 2,249
Operating lease impairment adjustment upon the adoption of ASU 2016-02 "Leases", tax | $ 14,427 | $ (12,776)

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