Note 6 - Accounting for Share-based Compensation (Details Textual) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Aug. 31, 2019	Sep. 01, 2018	Aug. 31, 2019	Aug. 31, 2019	Sep. 01, 2018
Fair Value Options Granted During Period Value Share-based Compensation	$ 12	$ 180	$ 9,426		$ 9,217
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	806	2,066	2,187		3,876
Proceeds from Stock Options Exercised	658	$ 2,841	2,495		$ 5,228
Total Fair Value of Nonvested Restricted Stock	$ 22,600		$ 22,600	$ 22,600
Repurchased Restricted Stock Shares	2,479	1,945	63,152		68,881
Deferred Compensation Plan, Matching Percentage			10.00%
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 7,493		$ 7,493	7,493
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition			1 year
Restricted Stock Units (RSUs) [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	9,106		$ 9,106	$ 9,106
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition				1 year
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	360	$ 278	8,641		$ 8,755
Selling, General and Administrative Expenses [Member]
Share-based Payment Arrangement, Expense	$ 5,998	$ 5,005	$ 21,657		$ 15,439

Percent matched on deferred compensation investment.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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