Stockholders' Equity - Per Share Results (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Nov. 30, 2017	Aug. 31, 2017	May 31, 2017	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	May 31, 2016	Feb. 29, 2016	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2015
Earnings per share:
Net Income	$ (490)	$ 1,329	$ 4,727	$ (939)	$ 1,339	$ (49)	$ (379)	$ (335)	$ 4,627	$ 576	$ 425
Weighted average shares outstanding for computation of basic per share results									5,010,000	5,117,000	5,151,000
Incremental shares from assumed exercise of Griffin stock options									28,000	6,000	17,000
Adjusted weighted average shares for computation of diluted per share results									5,038,000	5,123,000	5,168,000