Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies - Components of Other Comprehensive Income (Details) $ in Thousands	9 Months Ended
	Feb. 25, 2018 USD ($)
Balance	$ 228,152
Balance	250,150
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Balance	432
Other comprehensive income before reclassifications, net of tax effect	483
Amounts reclassified from OCI
Balance	$ 915