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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($)
Number of States in which Entity Operates | 8 |
Cash and Cash Equivalents, at Carrying Value, Ending Balance | $ 59,837 | $ 10,702
Advertising Expense | 1,800 | 2,200
Depreciation, Total | 27,100 | 26,100
Equity Method Investment, Other than Temporary Impairment | $ 9,700 | 0
Building and Building Improvements [Member] |  |
Property, Plant and Equipment, Useful Life (Year) | 30 years |
Machinery and Equipment [Member] | Minimum [Member] |  |
Property, Plant and Equipment, Useful Life (Year) | 10 years |
Machinery and Equipment [Member] | Maximum [Member] |  |
Property, Plant and Equipment, Useful Life (Year) | 15 years |
Software and Software Development Costs [Member] | Minimum [Member] |  |
Property, Plant and Equipment, Useful Life (Year) | 3 years |
Software and Software Development Costs [Member] | Maximum [Member] |  |
Property, Plant and Equipment, Useful Life (Year) | 5 years |
Vehicles [Member] | Minimum [Member] |  |
Property, Plant and Equipment, Useful Life (Year) | 3 years |
Vehicles [Member] | Maximum [Member] |  |
Property, Plant and Equipment, Useful Life (Year) | 7 years |
Land Improvements [Member] | Minimum [Member] |  |
Property, Plant and Equipment, Useful Life (Year) | 10 years |
Land Improvements [Member] | Maximum [Member] |  |
Property, Plant and Equipment, Useful Life (Year) | 20 years |
Other Current Assets [Member] |  |
Debt Issuance Costs, Net, Total | $ 900 |
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, Ending Balance | $ 47,400 | $ 0
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Top Ten Customers [Member] |  |
Concentration Risk, Percentage | 50.00% | 49.00%
Seneca Food Plants [Member] |  |
Number of Real Estate Properties | 26 |
Seneca Foods Warehouses [Member] |  |
Number of Real Estate Properties | 25 |

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