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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2026 USD ($) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 USD ($)
Number of States in which Entity Operates | 9 |  |
Interest Costs Capitalized | $ 0.5 |  |
Debt Issuance Costs, Current, Net | 1.3 |  |
Debt Issuance Costs, Noncurrent, Net | 0.4 |  |
Advertising Expense | $ 3.7 | $ 3.5 | $ 2.7
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Top Ten Customers [Member] |  |  |
Concentration Risk, Percentage | 56.00% | 53.00% |
Seneca Food Plants [Member] |  |  |
Number of Real Estate Properties | 27 |  |

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