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Note 6 - Revolving Credit Facility (Details Textual) - USD ($)
6 Months Ended 9 Months Ended
Jul. 05, 2016
Sep. 29, 2018
Dec. 30, 2017
Sep. 30, 2017
Accounts Receivable, Vegetable and Fruit Products Sold, Standard Payment Term     90 days  
Accounts Receivable, Vegetable and Fruit Products Sold, Maximum Payment Term     210 days  
Increase (Decrease) in Working Capital, Excluding Receivables Acquired from Business Combinations   $ (54,536,000)    
Revolving Credit Facility [Member]        
Debt Instrument, Term 5 years      
Line of Credit Facility, Maximum Borrowing Capacity During Nonproduction Period $ 400,000,000      
Line of Credit Facility, Maximum Borrowing Capacity During Production Period $ 500,000,000      
Long-term Line of Credit, Total   242,947,000   $ 272,609,000
Line of Credit Facility, Remaining Borrowing Capacity   $ 243,500,000