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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($)
Number of States in which Entity Operates | 8 |  |
Equity Method Investment, Other than Temporary Impairment |  | $ 6,300 |
Equity Method Investments | $ 0 |  |
Advertising Expense | $ 2,200 | $ 2,200 | $ 1,800
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Top Ten Customers [Member] |  |  |
Concentration Risk, Percentage | 55.00% | 53.00% |
Other Assets [Member] |  |  |
Debt Issuance Costs, Net | $ 600 |  |
Current and Non-Current Portion of Long Term Debt [Member] |  |  |
Debt Issuance Costs, Net | $ 600 |  |
Seneca Food Plants [Member] |  |  |
Number of Real Estate Properties | 26 |  |

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