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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