Note 8 - Post Employment Benefit Obligations - Components of Net Periodic Pension Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 29, 2020	Aug. 31, 2019	Aug. 29, 2020	Aug. 31, 2019
Service cost	$ 43	$ 47	$ 130	$ 141
Interest cost	67	110	201	331
Amortization of prior service costs	31	31	94	94
Amortization of loss	2	46	6	138
Net periodic pension cost	$ 143	$ 234	$ 431	$ 704