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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	Nov. 25, 2018	May 27, 2018
Investment in non-public company	$ 68,100	$ 66,500
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Interest rate swap contracts
Investment in non-public company
Total assets
Contingent consideration liability
Total liabilities
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Interest rate swap contracts	1,512	1,529
Investment in non-public company
Total assets	1,512	1,529
Contingent consideration liability
Total liabilities
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Interest rate swap contracts
Investment in non-public company	68,100	66,500
Total assets	68,100	66,500
Contingent consideration liability	3,100	4,000
Total liabilities	$ 3,100	$ 4,000

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