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Note 13 - Income Taxes - Reconciliation of Statutory Federal Income Tax Rate and Effective Income Tax Rate (Details)
12 Months Ended
Nov. 28, 2020
Nov. 30, 2019
Nov. 24, 2018
Nov. 25, 2017
Statutory federal income tax rate 21.00% 21.00% 22.20% 35.00%
CARES Act benefit 21.10% 0.00% 0.00%  
Revaluation of deferred tax assets resulting from new enacted rates 0.00% 0.00% 10.90%  
State income tax, net of federal benefit 1.70% (14.00%) 4.60%  
Impairment of non-deductible goodwill (2.50%) (23.20%) 0.00%  
Excess tax benefit from stock-based compensation (0.60%) 0.30% (1.50%)  
Other (2.80%) 5.10% (3.50%)  
Effective income tax rate 37.90% (10.80%) 32.70%