Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) - Summary of Fair Value of Assets and Liabilities Measure on Recurring Basis (USD $) In Thousands, unless otherwise specified	Aug. 25, 2013	May 26, 2013
Fair Value, Inputs, Level 1 [Member]
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) - Summary of Fair Value of Assets and Liabilities Measure on Recurring Basis [Line Items]
Marketable securities	$ 1,297	$ 1,545
Total	1,297	1,545
Fair Value, Inputs, Level 2 [Member]
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) - Summary of Fair Value of Assets and Liabilities Measure on Recurring Basis [Line Items]
Interest rate swap	123	163
Total	123	163
Fair Value, Inputs, Level 3 [Member]
Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) - Summary of Fair Value of Assets and Liabilities Measure on Recurring Basis [Line Items]
Investment in private company	35,000	29,600
Total	$ 35,000	$ 29,600