Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Aug. 31, 2013	Sep. 01, 2012	Aug. 31, 2013	Sep. 01, 2012
Per Share Results
Income (loss) as reported from continuing operations for computation of basic and diluted per share results, net of tax	$ (929)	$ 1,882	$ 269	$ 345
Income as reported from discontinued operations for computation of basic and diluted per share results, net of tax				1,647
Net income (loss)	$ (929)	$ 1,882	$ 269	$ 1,992
Weighted average shares outstanding for computation of basic per share results	5,146,000	5,139,000	5,143,000	5,137,000
Incremental shares from assumed exercise of Griffin stock options		4,000	7,000	4,000
Adjusted weighted average shares for computation of diluted per share results	5,146,000	5,143,000	5,150,000	5,141,000
Incremental shares from assumed exercise of stock options excluded due to anti-dilutive effect	10,000