Note 8 - Stockholders' Equity - Common Stock Outstanding (Details) - shares	12 Months Ended
	Nov. 28, 2020	Nov. 30, 2019	Dec. 01, 2018
Beginning balance (in shares)	51,241,190	50,732,796	50,388,839
Stock options exercised (in shares)	397,456	378,734	198,849
Deferred compensation paid (in shares)	118,742	5,354	7,152
Restricted units vested (in shares)	221,275	197,349	209,137
Shares withheld for taxes (in shares)	(72,000)	(73,043)	(71,181)
Ending balance (in shares)	51,906,663	51,241,190	50,732,796