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Note 14 - Related Party Transactions (Details Textual) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Director [Member] | Vegetables Supply [Member] |  |  |
Related Party Transaction, Amounts of Transaction | $ 2.8 | $ 3.0 | $ 3.1
Director [Member] | Supplier Concentration Risk [Member] | Cost of Goods and Service, Product and Service Benchmark [Member] |  |  |
Concentration Risk, Percentage | 2.00% |  |
Related Party Foudation [Member] | Charitable Contributions [Member] |  |  |
Related Party Transaction, Amounts of Transaction | $ 0.5 | 1.0 | $ 0.5
Beneficiaries of Former Employees That Have Family Relationships to Two of Current Directors [Member] | Retirement Arrangements [Member] |  |  |
Liability, Defined Benefit Plan | $ 1.0 | $ 1.0 |

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