Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2015	Aug. 31, 2014	Aug. 31, 2015	Aug. 31, 2014
Per Share Results
Income (loss) from continuing operations for computation of basic and diluted per share results, net of tax	$ 1,203	$ (198)	$ 261	$ (1,521)
Income from discontinued operations for computation of basic and diluted per share results, net of tax		26		144
Net income (loss)	$ 1,203	$ (172)	$ 261	$ (1,377)
Weighted average shares outstanding for computation of basic per share results	5,153,000	5,150,000	5,151,000	5,148,000
Incremental shares from assumed exercise of Griffin stock options	23,000		21,000
Adjusted weighted average shares for computation of diluted per share results	5,176,000	5,150,000	5,172,000	5,148,000
Incremental shares from assumed exercise of stock options excluded due to anti-dilutive effect		3,000		12,000