Note 8 - Post Employment Benefit Obligations - Components of Net Periodic Pension Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 28, 2021	Aug. 29, 2020	Aug. 28, 2021	Aug. 29, 2020
Service cost	$ 31	$ 43	$ 91	$ 130
Interest cost	48	67	146	201
Amortization of prior service costs	31	31	94	94
Amortization of loss	15	2	45	6
Net periodic pension cost	$ 125	$ 143	$ 376	$ 431