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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. 26, 2017 | May 28, 2017
--- | --- | ---
Investment in non-public company |  | $ 65,800 | $ 63,600
Fair Value, Inputs, Level 1 [Member] |  |  |
Investment in non-public company |  |  |
Total |  |  |
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member] |  |  |
Interest rate swap (1) | [1] |  |
Fair Value, Inputs, Level 2 [Member] |  |  |
Investment in non-public company |  |  |
Total |  | 909 | 688
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |  |
Interest rate swap (1) | [1] | 909 | 688
Fair Value, Inputs, Level 3 [Member] |  |  |
Investment in non-public company |  | 65,800 | 63,600
Total |  | 65,800 | 63,600
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member] |  |  |
Interest rate swap (1) | [1] |  |
[1] | Included in Other assets.

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