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Note 13 - Other Operating Income and Expense (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Other Operating Income (Expense), Net | $ (1,174) | $ 29,014
Gain (Loss) on Extinguishment of Debt, Total | 500 | (0)
Closing of Midwest and Northwest Plants [Member] | Employee Severance [Member] |  |
Restructuring Costs, Total |  | 200
Other Operating Income (Expense) [Member] |  |
Pension and Other Postretirement Benefits Cost (Reversal of Cost), Total | 2,500 | 1,200
Rental Income, Nonoperating | 300 |
Other Operating Income (Expense) [Member] | Midwest Plant [Member] |  |
Gain (Loss) On Sale of Plant |  | 1,500
Other Operating Income (Expense) [Member] | Properties Held For Sale [Member] |  |
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property | 1,100 |
Other Operating Income (Expense) [Member] | Unused Fixed Assets [Member] |  |
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property | 1,600 | $ 31,900
Gain (Loss) on Extinguishment of Debt, Total | $ 500 |

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