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Note 1 - Summary of Significant Accounting Policies (Details Textual) | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Apr. 01, 2019 USD ($) | Mar. 31, 2018 USD ($)
Number of States in which Entity Operates | 9 |  |  |
Debt Issuance Cost, Gross, Noncurrent | $ 300,000 | $ 100,000 |  |
Advertising Expense | 2,200,000 | 2,100,000 |  |
Depreciation, Total | 26,100,000 | 29,500,000 |  |
Gain (Loss) on Sale of Assets and Asset Impairment Charges | 7,800,000 |  |  |
Operating Lease, Right-of-Use Asset | 60,663,000 |  |  |
Operating Lease, Liability, Total | 64,309,000 |  |  |
Stockholders' Equity Attributable to Parent, Ending Balance | 394,364,000 | 417,485,000 |  |
Retained Earnings [Member] |  |  |  |
Stockholders' Equity Attributable to Parent, Ending Balance | $ 459,797,000 | 409,504,000 |  | $ 403,780,000
Accounting Standards Update 2016-02 [Member] |  |  |  |
Operating Lease, Right-of-Use Asset |  |  | $ 88,333,000 |
Operating Lease, Liability, Total |  |  | 91,025,000 |
Stockholders' Equity, Before Tax Effect |  |  | (2,692,000) |
Stockholders' Equity, Tax Effect |  |  | (673,000) |
Accounting Standards Update 2016-02 [Member] | Retained Earnings [Member] |  |  |  |
Stockholders' Equity Attributable to Parent, Ending Balance |  |  | (2,019,000) |
Accounting Standards Update 2016-02 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member] |  |  |  |
Stockholders' Equity Attributable to Parent, Ending Balance |  | $ (2,019,000) | $ (2,019,000) |
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 |  |  |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | GMOL and B&G Foods [Member] |  |  |  |
Concentration Risk, Percentage | 9.00% | 6.00% |  |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Top Ten Customers [Member] |  |  |  |
Concentration Risk, Percentage | 49.00% | 47.00% |  |
Seneca Food Plants [Member] |  |  |  |
Number of Real Estate Properties | 27 |  |  |
Seneca Foods Warehouses [Member] |  |  |  |
Number of Real Estate Properties | 30 |  |  |

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