Note 10 - Accumulated Other Comprehensive Loss - Activity in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 27, 2021	Nov. 28, 2020
Balance	$ 158,030	$ 178,670
Actuarial losses	(762)
Net pension amortization reclassified from accumulated other comprehensive loss	186	133
Balance	162,732	158,030
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(1,394)	(1,236)
Actuarial losses		(345)
Tax effects	147	54
Balance	$ (1,823)	$ (1,394)