Stockholders' Equity - Per Share Results (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2016	Aug. 31, 2015
Per Share Results
Net loss	$ (49)	$ 1,203	$ (763)	$ 261
Weighted average shares outstanding for computation of basic per share results	5,093,000	5,153,000	5,132,000	5,151,000
Incremental shares from assumed exercise of Griffin stock options		23,000		21,000
Adjusted weighted average shares for computation of diluted per share results	5,093,000	5,176,000	5,132,000	5,172,000
Incremental shares from assumed exercise of stock options excluded due to anti-dilutive effect	23,000		2,000