Note 9 - Post Employment Benefit Obligations - Recognized Deferred Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 25, 2018	Aug. 26, 2017	Aug. 25, 2018	Aug. 26, 2017
Unfunded Deferred Compensation Plan [Member]
Deferred compensation expense	$ 161	$ 68	$ 320	$ 203