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Note 2 - Revenue Recognition - Segment Revenue Disaggregated by Product Category Groups (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Net sales | $ 1,509,352 | $ 1,385,280 | $ 1,467,644
Canned Vegetables [Member] |  |  |
Net sales | 1,253,257 | 1,135,983 | 1,172,635
Frozen [Member] |  |  |
Net sales | 121,211 | 123,895 | 102,197
Fruit [Member] |  |  |
Net sales | 91,495 | 84,708 | 88,431
Snack [Member] |  |  |
Net sales | 12,661 | 12,332 | 10,999
Prepared Foods [Member] |  |  |
Net sales | 0 | 0 | 71,866
Manufactured Product, Other [Member] |  |  |
Net sales | $ 30,728 | $ 28,362 | $ 21,516

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