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Note 3 - Property and Equipment (Details Textual) - USD ($)
12 Months Ended
May. 31, 2015
May. 25, 2014
May. 26, 2013
Capitalized Computer Software, Net $ 1,100,000 $ 1,100,000  
Capital Leases, Balance Sheet, Assets by Major Class, Net 0 0  
Depreciation, Depletion and Amortization, Nonproduction 6,200,000 6,200,000 $ 6,300,000
Capitalized Computer Software, Amortization $ 158,000 $ 189,000 $ 160,000