Stockholders' Equity (Details 2) (2009 Stock Option Plan, USD $)	3 Months Ended
	Feb. 28, 2014	Feb. 28, 2015	Nov. 30, 2014
2009 Stock Option Plan
Activity under the Griffin Stock Option Plan
Outstanding at beginning of period (in shares)	239,677	222,001	222,001
Forfeited (in shares)	(23,000)
Outstanding at end of period (in shares)	216,677	222,001	222,001
Weighted Avg. Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 30.35	$ 30.35	$ 30.35
Forfeited (in dollars per share)	$ 30.27
Outstanding at end of period (in dollars per share)	$ 30.36	$ 30.35	$ 30.35