Note 12 - Accumulated Other Comprehensive Loss - Activity in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		12 Months Ended
		Nov. 30, 2019	Nov. 24, 2018
Balance		$ 190,309	$ 191,460
Net pension amortization reclassified from accumulated other comprehensive loss		308	430
Balance		178,670	190,309
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance		(2,338)	(2,570)
OCI, before Reclassifications, before Tax, Attributable to Parent		1,172
Tax effects		(378)	(269)
Balance		$ (1,236)	(2,338)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | ASU 2018-02 [Member]
Reclassification of certain tax effects to retained earnings (1)	[1]		(545)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
OCI, before Reclassifications, before Tax, Attributable to Parent			$ 616

[1] In 2018 we adopted ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Comprehensive Income. ASU 2018-02 addressed the impact of the remeasurement of deferred taxes on items in accumulated other comprehensive income due to the reduction in federal statutory rates arising from the Tax Cuts and Jobs Act of December 2017 by allowing the transfer of certain tax effects carried over from prior years to retained earnings as of the beginning of fiscal 2018.