Note 9 - Post Employment Benefit Obligations - Components of Net Periodic Pension Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2019	Aug. 25, 2018	Aug. 31, 2019	Aug. 25, 2018
Service cost	$ 47	$ 49	$ 141	$ 147
Interest cost	110	105	331	315
Amortization of prior service costs	31	31	94	93
Amortization of transition obligation	0	11	0	33
Amortization of loss	46	65	138	195
Net periodic pension cost	$ 234	$ 261	$ 704	$ 783