Note 12 - Fair Value Measurements - Fair Values of Financial Assets and Liabilities Measured on a Recurring Basis (Details) - Fair Value, Inputs, Level 1 [Member] - USD ($) $ in Thousands	Jun. 06, 2017	May 31, 2016
Deferred compensation plan – Assets	$ 5,631	$ 6,660
Deferred compensation plan – Liabilities	$ (5,631)	$ (6,660)

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

No definition available.

Name:	us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant