Note 14 - Income Taxes - Reconciliation of Statutory Federal Income Tax Rate and Effective Income Tax Rate (Details)	12 Months Ended
	Nov. 30, 2019	Nov. 24, 2018	Nov. 25, 2017
Statutory federal income tax rate	21.00%	22.20%	35.00%
Revaluation of deferred tax assets resulting from new enacted rates		10.90%
State income tax, net of federal benefit	(14.00%)	4.60%	3.90%
Impairment of non-deductible goodwill	(23.20%)
Excess tax benefits from stock-based compensation	0.30%	(1.50%)	(1.80%)
Other	5.10%	(3.50%)	(2.60%)
Effective income tax rate	(10.80%)	32.70%	34.50%