Note 8 - Employee Post-employment Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands		12 Months Ended
		Jun. 06, 2017	May 31, 2016	Jun. 02, 2015
Pension Plan [Member]
Interest cost		$ 1,711	$ 1,999	$ 1,773
Expected return on plan assets		(370)	(411)	(498)
Amortization of prior service cost (a)	[1]		1	1
Recognized actuarial loss		1,542	2,218	1,718
Curtailment expense			1
Net periodic benefit cost		2,909	4,120	3,295
Service cost		26	312	301
Postretirement Medical and Life Benefits [Member]
Interest cost		36	47	46
Recognized actuarial loss		71	130	134
Net periodic benefit cost		108	181	184
Service cost		$ 1	$ 4	$ 4

[1] Prior service costs are amortized on a straight-line basis over the average remaining service period of employees expected to receive benefits.