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Note 7 - Debt - Long-term Debt (Details) (Parentheticals) - Term Loan [Member] - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Feb. 25, 2018
May 28, 2017
Periodic payment $ 1,250 $ 1,250
Minimum [Member]    
Interest rate 1.25% 1.25%
Maximum [Member]    
Interest rate 2.25% 2.25%