Note 9 - Post Employment Benefit Obligations (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	May 27, 2017	Aug. 31, 2019	Nov. 24, 2018
Unfunded Deferred Compensation Plan [Member]
Deferred Compensation Arrangement with Individual, Recorded Liability		$ 1,782	$ 1,837
Deferred Compensation, Management Savings Plan [Member]
Deferred Compensation Arrangement with Individual, Recorded Liability		786	611
Management Savings Plan [member]
Deferred Compensation Arrangement with Individual, Contributions by Employer	$ 2,000
Defined Benefit Plan, Fixed Future Benefit Award, Individual Participants	$ 400
Deferred Compensation Arrangement with Individual, Recorded Liability		1,147	1,078
Supplemental Employee Retirement Plan [Member]
Liability, Other Postretirement Defined Benefit Plan		$ 10,065	$ 10,574