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Note 13 - Other Operating Income and Expense (Details Textual) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Other Operating Income (Expense) [Member] |  |
Pension and Other Postretirement Benefits Cost (Reversal of Cost), Total | $ 1.2 |
Gain (Loss) on Disposition of Property Plant Equipment, Total |  | $ 1.2
Other Operating Income (Expense) [Member] | Midwest Plant [Member] |  |
Gain (Loss) On Sale of Plant |  | 3.3
Other Operating Income (Expense) [Member] | Northwest Plant [Member] |  |
Gain (Loss) On Sale of Plant |  | $ 8.2
Closing of Midwest and Northwest Plants [Member] | Employee Severance [Member] |  |
Restructuring Costs, Total | 0.2 |
Prepared Foods Business [Member] |  |
Gain (Loss) on Disposition of Business | 34.8 |
Disposal of Equipment from Sold Northwest Plan [Member] |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal | (0.8) |
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property | (0.4) |
Disposal of Equipment Previously Held for Sale [Member] |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal | $ (3.2) |

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