Stockholders' Equity - Per Share Results (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Nov. 30, 2016	Aug. 31, 2016	May 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2015	May 31, 2015	Feb. 28, 2015	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2014
Per Share Results
Income (loss) from continuing operations for computation of basic and diluted per share results, net of tax									$ 576	$ 425	$ (1,248)
Income from discontinued operations for computation of basic and diluted per share results, net of tax											144
Net income (loss)	$ 1,339	$ (49)	$ (379)	$ (335)	$ 164	$ 1,203	$ (234)	$ (708)	$ 576	$ 425	$ (1,104)
Weighted average shares outstanding for computation of basic per share results									5,117,000	5,151,000	5,148,000
Incremental shares from assumed exercise of Griffin stock options									6,000	17,000
Adjusted weighted average shares for computation of diluted per share results									5,123,000	5,168,000	5,148,000
Incremental shares from assumed exercise of stock options excluded due to anti-dilutive effect											11,000