Note 7 - Stockholders' Equity - Common Stock Outstanding (Details) - shares	12 Months Ended
	Nov. 30, 2019	Dec. 01, 2018	Dec. 02, 2017
Beginning balance (in shares)	50,732,796	50,388,839	50,141,343
Stock options exercised (in shares)	378,734	198,849	514,064
Deferred compensation paid (in shares)	5,354	7,152	24,048
Restricted units vested (in shares)	197,349	209,137	140,614
Shares withheld for taxes (in shares)	(73,043)	(71,181)	(56,230)
Shares repurchased under repurchase program (in shares)	0	0	(375,000)
Ending balance (in shares)	51,241,190	50,732,796	50,388,839