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Note 10 - Employee Savings and Investment Plans (Details Textual) - USD ($)
$ in Millions
12 Months Ended
May 28, 2017
May 29, 2016
May 31, 2015
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 1.5 $ 1.3 $ 1.2
First Three Percent Match [Member]      
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 100.00%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 3.00%    
Next Two Percent Match [Member]      
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 50.00%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 2.00%    
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%