Stockholders' Equity - Per Share Results (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2018
Earnings per share:
Net (loss) income	$ (12,717)	$ 3,668	$ (1,653)
Weighted average shares outstanding for computation of basic per share results	5,259,000	5,070,000	5,023,000
Incremental shares from assumed exercise of Griffin stock options		36,000
Adjusted weighted average shares for computation of diluted per share results	5,259,000	5,106,000	5,023,000
Incremental shares from assumed exercise of stock options excluded due to anti-dilutive effect	64,000		57,000
Warrant
Earnings per share:
Incremental shares from assumed exercise of stock options excluded due to anti-dilutive effect	504,590