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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($)
Number of States in which Entity Operates | 8 |
Cash and Cash Equivalents, at Carrying Value, Total | $ 10,904 | $ 59,837
Equity Method Investment, Other than Temporary Impairment | 6,300 | 9,700
Equity Method Investments | 0 |
Advertising Expense | $ 2,200 | $ 1,800
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Top Ten Customers [Member] |  |
Concentration Risk, Percentage | 53.00% | 50.00%
Other Current Assets [Member] |  |
Debt Issuance Costs, Net, Total | $ 800 |
Current and Non-Current Portion of Long Term Debt [Member] |  |
Debt Issuance Costs, Net, Total | 100 |
Money Market Funds [Member] |  |
Cash and Cash Equivalents, at Carrying Value, Total | $ 0 |
Seneca Food Plants [Member] |  |
Number of Real Estate Properties | 26 |

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