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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) | Dec. 30, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jul. 01, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Oct. 01, 2016 USD ($) | Jul. 02, 2016 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($)
Number of States in which Entity Operates | 11 |  |  |  |  |  |  |  | 11 |  |
Debt Issuance Costs, Gross, Current | $ 700 |  |  |  |  |  |  |  | $ 700 |  |
Debt Issuance Cost, Gross, Noncurrent | 100 |  |  |  |  |  |  |  | 100 |  |
Revenues, Total |  | $ 387,689 | $ 338,470 | $ 288,927 | $ 280,690 | $ 356,767 | $ 352,606 | $ 272,135 | 1,314,765 | $ 1,262,198 | $ 1,279,567
Advertising Expense |  |  |  |  |  |  |  |  | 2,400 | 2,100 | 2,000
Depreciation, Total |  |  |  |  |  |  |  |  | 31,100 | 24,200 | 21,400
Gain (Loss) on Sale of Assets and Asset Impairment Charges |  |  |  |  |  |  |  |  |  |  | (5,100)
Net Income (Loss) Attributable to Parent, Total |  | 4,377 | (2,958) | (980) | 320 | 7,789 | 6,821 | 965 | (13,811) | 15,895 | 56,399
Stockholders' Equity Attributable to Parent, Ending Balance | 396,930 | $ 422,439 | $ 418,744 | $ 424,330 | $ 425,204 | $ 406,610 | $ 399,617 | $ 393,342 | 396,930 | 425,204 | 392,835
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect | 2,400 |  |  |  |  |  |  |  |  |  |
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Pro Forma [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 14,000 |  |
Net Income (Loss) Attributable to Parent, Total |  |  |  |  |  |  |  |  | 5,300 |  |
Stockholders' Equity Attributable to Parent, Ending Balance | 2,019,000 |  |  |  |  |  |  |  | $ 2,019,000 |  |
Building and Building Improvements [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  | 30 years |  |
Machinery and Equipment [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  | 10 years |  |
Machinery and Equipment [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  | 15 years |  |
Software and Software Development Costs [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  | 3 years |  |
Software and Software Development Costs [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  | 5 years |  |
Vehicles [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  | 3 years |  |
Vehicles [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  | 7 years |  |
Land Improvements [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  | 10 years |  |
Land Improvements [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  | 20 years |  |
Shipping and Handling [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues, Total |  |  |  |  |  |  |  |  | $ 40,600 | $ 38,000 | $ 38,300
General Mills Operations LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Unshipped Product | $ 14,400 |  |  |  |  |  |  |  | $ 14,400 |  |
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | GMOL and B&G Foods [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 9.00% | 11.00% | 12.00%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Top Ten Customers [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 45.00% | 46.00% |
Seneca Food Plants [Member] |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties | 30 |  |  |  |  |  |  |  | 30 |  |
Seneca Foods Warehouses [Member] |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties | 34 |  |  |  |  |  |  |  | 34 |  |

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