Note 8 - Employee Post-employment Benefits - Fair Values of Assets Held by the Retirement Plan by Asset Category (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2016	Jun. 02, 2015
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets as of measurement date	$ 249	$ 78
Total assets reported as of fiscal year end	249	78
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] | US-based Companies [Member]
Fair value of plan assets as of measurement date	2,561	2,701
Total assets reported as of fiscal year end	2,561	2,701
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] | International-based Companies [Member]
Fair value of plan assets as of measurement date	1,222	1,277
Total assets reported as of fiscal year end	1,222	1,277
Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member] | As of Measurement Date [Member]
Fair value of plan assets as of measurement date	1,259	1,584
Total assets reported as of fiscal year end	1,259	1,584
Public Real Estate Investment Trusts [Member] | Fair Value, Inputs, Level 1 [Member] | As of Measurement Date [Member]
Fair value of plan assets as of measurement date	315	328
Total assets reported as of fiscal year end	315	328
Other Retirement Plan Assets [Member] | Fair Value, Inputs, Level 1 [Member] | As of Measurement Date [Member]
Fair value of plan assets as of measurement date	603	883
Total assets reported as of fiscal year end	603	883
As of Measurement Date [Member]
Fair value of plan assets as of measurement date	6,209	6,851
Total assets reported as of fiscal year end	6,209	6,851
Fair value of plan assets as of measurement date	6,209	6,786
Benefit payments after measurement date		(65)
Total assets reported as of fiscal year end	$ 6,209	$ 6,786