Consolidated Statements of Stockholders' Equity - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Nov. 30, 2013	10,859,318
Balance at Nov. 30, 2013	$ 54,297,000		$ 104,526,000	$ (1,414,000)	$ 157,409,000
Comprehensive income
Net income			9,299,000		9,299,000
Actuarial adjustment to SERP, net of tax				(560,000)	(560,000)
Regular dividends			(2,983,000)		(2,983,000)
Special dividend			(2,102,000)		(2,102,000)
Issuance of common stock (in shares)	69,619
Issuance of common stock	$ 348,000	260,000			608,000
Purchase and retirement of common stock (in shares)	(435,544)
Purchase and retirement of common stock	$ (2,178,000)	(1,511,000)	(2,401,000)		(6,090,000)
Stock-based compensation		951,000			951,000
Excess tax benefits from Stock-based compensation		300,000			300,000
Balance (in shares) at Nov. 29, 2014	10,493,393
Balance at Nov. 29, 2014	$ 52,467,000		106,339,000	(1,974,000)	156,832,000
Comprehensive income
Net income			20,433,000		20,433,000
Actuarial adjustment to SERP, net of tax				(704,000)	(704,000)
Regular dividends			(3,684,000)		(3,684,000)
Special dividend			(2,184,000)		(2,184,000)
Issuance of common stock (in shares)	503,814
Issuance of common stock	$ 2,519,000	3,511,000			6,030,000
Purchase and retirement of common stock (in shares)	(81,186)
Purchase and retirement of common stock	$ (406,000)	(1,843,000)			(2,249,000)
Stock-based compensation		894,000			894,000
Excess tax benefits from Stock-based compensation		1,998,000			$ 1,998,000
Balance (in shares) at Nov. 28, 2015	10,916,021				10,916,021
Balance at Nov. 28, 2015	$ 54,580,000	4,560,000	120,904,000	(2,678,000)	$ 177,366,000
Comprehensive income
Net income			15,829,000		15,829,000
Actuarial adjustment to SERP, net of tax				125,000	125,000
Regular dividends			(4,127,000)		(4,127,000)
Special dividend			(3,218,000)		(3,218,000)
Issuance of common stock (in shares)	64,316
Issuance of common stock	$ 322,000	(25,000)			297,000
Purchase and retirement of common stock (in shares)	(257,390)
Purchase and retirement of common stock	$ (1,287,000)	(5,183,000)			(6,470,000)
Stock-based compensation		903,000			$ 903,000
Balance (in shares) at Nov. 26, 2016	10,722,947				10,722,947
Balance at Nov. 26, 2016	$ 53,615,000	$ 255,000	$ 129,388,000	$ (2,553,000)	$ 180,705,000