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Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies - Allowance for Sales Returns and Doubtful Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
May. 31, 2015
May. 25, 2014
May. 26, 2013
Balance at beginning of period $ 516 $ 583 $ 512
Additions from acquisitions and adjustments charged to revenue and expenses   143 109
Write offs, net of recoveries $ (134) (210) (38)
Balance at end of period $ 382 $ 516 $ 583