Note 9 - Accounting for Share-based Compensation (Details Textual) - USD ($) $ in Thousands	12 Months Ended
Nov. 30, 2019	Dec. 01, 2018	Dec. 02, 2017
Fair Value Options Granted During Period Value Share-based Compensation	$ 9,956	$ 9,217	$ 17,157
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 7,590	4,534	8,677
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	6 years 9 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 28,160
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	2,669,829
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	5 years 4 months 24 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 23,850
Proceeds, Issuance of Shares, Share-based Payment Arrangement, Including Option Exercised, Total	10,885	6,237	17,705
Share-based Payment Arrangement, Exercise of Option, Tax Benefit	1,298	$ 868	$ 2,723
Total Fair Value of Nonvested Restricted Stock	$ 22,722
Repurchased Restricted Stock Shares	73,043	71,181	56,230
Selling, General and Administrative Expenses [Member]
Share-based Payment Arrangement, Expense	$ 24,003	$ 17,113	$ 17,503
Non Employee Directors [Member]
Deferred Compensation Plan, Matching Percentage	10.00%
Deferred Compensation Arrangement with Individual, Discretionary Awards, Employer Contribution Units Paid	21,504,000	18,436,000	15,738,000
Deferred Compensation Arrangement with Individual, Employer Matches Contribution Fair Value	$ 167	$ 152	$ 133
Deferred Compensation Arrangement with Individual, Discretionary Awards Employer Contribution, Fair Value	$ 1,035	1,035	805
Employees [Member]
Deferred Compensation Plan, Matching Percentage	10.00%
Deferred Compensation Arrangement with Individual, Employer Matches Contribution Fair Value	$ 41	27	26
2018 Master Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1,474,436
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount	$ 6,348
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	9 months 18 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 Rights, Percentage	33.30%
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	1 year
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 8,970	8,892	7,708
Share-based Payment Arrangement, Expense, Tax Benefit	$ 1,574	$ 2,649	$ 3,059
Restricted Stock [Member] \| Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	33.30%
Restricted Stock Units (RSUs) [Member]
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount	$ 7,477
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	10 months 24 days

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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