Note 7 - Stockholders' Equity - Common Stock Outstanding (Details) - shares	12 Months Ended
	Dec. 02, 2017	Dec. 03, 2016	Nov. 28, 2015
Beginning balance (in shares)	50,141,343	50,074,310	50,310,803
Stock options exercised (in shares)	514,064	593,891	275,035
Shares swapped for stock option exercises (in shares)		(71,659)	(39,883)
Deferred compensation paid (in shares)	24,048	7,235	8,852
Restricted units vested (in shares)	140,614	105,552	83,494
Shares withheld for taxes (in shares)	(56,230)	(67,807)	(54,454)
Restricted shares forfeited (in shares)		(179)	(9,537)
Shares repurchased under repurchase program (in shares)	(375,000)	(500,000)	(500,000)
Ending balance (in shares)	50,388,839	50,141,343	50,074,310