Note 8 - Accounting for Share-based Compensation (Details Textual) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 02, 2017	Aug. 27, 2016	Sep. 02, 2017	Aug. 27, 2016
Allocated Share-based Compensation Expense	$ 3,191	$ 2,501	$ 12,034	$ 9,469
Excess Tax Benefit from Share-based Compensation, Operating Activities	151	870	1,504	1,462
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options	8,818		8,818
Fair Value Options Granted During Period Value Share-based Compensation	46	47	7,803	6,509
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	474	3,365	7,099	5,114
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options	1,107	$ 2,677	15,033	$ 9,760
Total Fair Value of Nonvested Restricted Stock	$ 21,240		$ 21,240
Repurchased Restricted Stock Shares	1,837	189	55,646	67,742
Employees [Member]
Deferred Compensation Plan, Matching Percentage			10.00%
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term			1 year 36 days
Restricted Stock Units (RSUs) [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	$ 14,376		$ 14,376
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			1 year 73 days
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 250	$ 25	$ 7,643	$ 6,101

Percent matched on deferred compensation investment.

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Fair value of options granted during the period.

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Shares of restricted stock repurchased during the period.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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Amount of cash inflow from issuance of shares under share-based compensation arrangement. Issuance includes, but is not limited to, exercise of stock options and similar instruments.

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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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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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