Note 9 - Accounting for Share-based Compensation (Details Textual) - USD ($) $ in Thousands	12 Months Ended
Nov. 28, 2020	Nov. 30, 2019	Dec. 01, 2018
Fair Value Options Granted During Period Value Share-based Compensation	$ 10,132	$ 9,956	$ 9,217
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 6,563	7,590	4,534
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)	6 years 8 months 12 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 38,430
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)	2,983,960
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Year)	5 years 4 months 24 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 27,098
Proceeds, Issuance of Shares, Share-based Payment Arrangement, Including Option Exercised, Total	12,321	10,885	6,237
Share-based Payment Arrangement, Exercise of Option, Tax Benefit	1,278	$ 1,298	$ 868
Total Fair Value of Nonvested Restricted Stock	$ 19,984
Repurchased Restricted Stock Shares (in shares)	70,380	73,043	71,181
Selling, General and Administrative Expenses [Member]
Share-based Payment Arrangement, Expense	$ 16,914	$ 24,003	$ 17,113
Non Employee Directors [Member]
Deferred Compensation Plan, Matching Percentage	10.00%
Deferred Compensation Arrangement with Individual, Discretionary Awards, Employer Contribution Units Paid (in shares)	21,323	21,504	18,436
Deferred Compensation Arrangement with Individual, Employer Matches Contribution Fair Value	$ 128	$ 167	$ 152
Deferred Compensation Arrangement with Individual, Discretionary Awards Employer Contribution, Fair Value	$ 920	1,035	1,035
Employees [Member]
Deferred Compensation Plan, Matching Percentage	10.00%
Deferred Compensation Arrangement with Individual, Employer Matches Contribution Fair Value	$ 56	41	27
2018 Master Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)	1,679,579
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 6,044
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	8 months 12 days
Share-based Payment Arrangement, Option [Member] \| Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	1 year
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	33.30%
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	10 years
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 10,362	8,970	8,892
Share-based Payment Arrangement, Expense, Tax Benefit	$ 2,136	$ 1,574	$ 2,649
Restricted Stock [Member] \| Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	1 year
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	33.30%
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	3 years
Restricted Stock Units (RSUs) [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 5,304
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	10 months 24 days

The fair value of the discretionary award amount contributed into the deferred compensation arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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