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Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies - Fair Value of Assets and Liabilities (Details) - USD ($)
$ in Thousands
May 27, 2018
May 28, 2017
Investment in non-public company $ 66,500 $ 63,600
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Investment in non-public company
Contingent consideration liability (2) [1]
Total
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member]    
Interest rate swap (1) [2]
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Investment in non-public company
Contingent consideration liability (2) [1]
Total 1,529 688
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member]    
Interest rate swap (1) [2] 1,529 688
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Investment in non-public company 66,500 63,600
Contingent consideration liability (2) [1] (4,000) (5,900)
Total 62,500 57,700
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member]    
Interest rate swap (1) [2]
[1] Included in Other non-current liabilities in the accompanying consolidated balance sheets.
[2] Included in Other assets in the accompanying consolidated balance sheets.