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Note 7 - Debt (Details Textual) - USD ($)
 12 Months Ended
Sep. 23, 2016
May 28, 2017
May 29, 2016
May 31, 2015
Nov. 01, 2016
Long-term Debt   $ 47,239,000 $ 53,845,000    
Debt Issuance Costs, Net   261,000 817,000    
Line of Credit, Current   3,000,000 3,500,000 [1]    
Gain (Loss) on Extinguishment of Debt $ (1,200,000) (1,233,000) [2] [2]  
Payment for Debt Extinguishment or Debt Prepayment Cost 233,000 233,000 [2] [2]  
Write off of Deferred Debt Issuance Cost 1,000,000        
Apio [Member] | Amortization of Loan Origination Fees [Member]          
Interest Expense, Other   $ 142,000 293,000 206,000  
Apio [Member] | GE Capital and BofA [Member]          
Capitalized Loan Origination Fees     $ 200,000 $ 397,000  
Interest Rate Swap [Member] | BMO [Member]          
Derivative, Notional Amount         $ 50,000,000
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap [Member] | BMO [Member]          
Derivative, Fixed Interest Rate         1.22%
Credit Agreement With JPMorgan Chase, BMO Harris Bank, and City National Bank [Member]          
Debt Instrument, Additional Borrowing Amount 75,000,000        
Debt Issuance Costs, Net $ 897,000        
Credit Agreement With JPMorgan Chase, BMO Harris Bank, and City National Bank [Member] | Prime Rate [Member] | Minimum [Member]          
Debt Instrument, Basis Spread on Variable Rate 0.25%        
Credit Agreement With JPMorgan Chase, BMO Harris Bank, and City National Bank [Member] | Prime Rate [Member] | Maximum [Member]          
Debt Instrument, Basis Spread on Variable Rate 1.25%        
Credit Agreement With JPMorgan Chase, BMO Harris Bank, and City National Bank [Member] | Eurodollar [Member] | Minimum [Member]          
Debt Instrument, Basis Spread on Variable Rate 1.25%        
Credit Agreement With JPMorgan Chase, BMO Harris Bank, and City National Bank [Member] | Eurodollar [Member] | Maximum [Member]          
Debt Instrument, Basis Spread on Variable Rate 2.25%        
Credit Agreement With JPMorgan Chase, BMO Harris Bank, and City National Bank [Member] | Term Loan [Member]          
Long-term Debt $ 50,000,000        
Debt Instrument, Term 5 years        
Debt Instrument, Periodic Payment $ 1,250,000        
Debt Instrument, Interest Rate, Effective Percentage   2.72%      
Debt Issuance Costs, Net 299,000        
Credit Agreement With JPMorgan Chase, BMO Harris Bank, and City National Bank [Member] | Revolving Credit Facility [Member]          
Line of Credit Facility, Maximum Borrowing Capacity 100,000,000        
Debt Issuance Costs, Net 598,000        
Line of Credit, Current $ 1,500,000 $ 3,000,000      
Line of Credit Facility, Interest Rate at Period End   2.57%      
[1] Derived from audited financial statements. See Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies for discussion of accounting guidance adopted during the period.
[2] See Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies for a discussion of accounting principles adopted during the period.