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Note 10 - Employee Savings and Investment Plans (Details Textual) - USD ($)
12 Months Ended
May. 31, 2015
May. 25, 2014
May. 26, 2013
Minimum [Member]      
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 1.00%    
Maximum [Member]      
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 50.00%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 67.00%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 6.00%    
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 1,200,000 $ 1,100,000 $ 939,000