Note 8 - Employee Post-employment Benefits - Changes in the Amounts Recognized in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 06, 2017	May 31, 2016
Pension Plan [Member]
Beginning of year	$ (16,821)	$ (17,149)
Net actuarial (loss)/gain	367	(1,891)
Amortization of prior service credit		1
Amortization of actuarial loss	1,542	2,218
End of year	(14,912)	(16,821)
Postretirement Medical and Life Benefits [Member]
Beginning of year	(491)	(994)
Net actuarial (loss)/gain	147	373
Amortization of prior service credit
Amortization of actuarial loss	71	130
End of year	$ (273)	$ (491)