Stockholders' Equity (Details 3) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	9 Months Ended
	Aug. 31, 2014	Aug. 31, 2014
2009 Stock Option Plan
Griffin Stock Option Plan
Weighted Avg. Remaining Contractual Life	5 years 6 months
$23.00-$28.00
Griffin Stock Option Plan
Exercise prices, low end of range (in dollars per share)		$ 23.00
Exercise prices, high end of range (in dollars per share)		$ 28.00
Outstanding at ending of the year (in shares)	18,068	18,068
Weighted Avg. Exercise Price (in dollars per share)	$ 25.45	$ 25.45
Weighted Avg. Remaining Contractual Life	6 years 2 months 12 days
Total Intrinsic Value	$ 63	$ 63
$28.00-$32.00
Griffin Stock Option Plan
Exercise prices, low end of range (in dollars per share)		$ 28.00
Exercise prices, high end of range (in dollars per share)		$ 32.00
Outstanding at ending of the year (in shares)	120,858	120,858
Weighted Avg. Exercise Price (in dollars per share)	$ 28.90	$ 28.90
Weighted Avg. Remaining Contractual Life	6 years 4 months 24 days
Total Intrinsic Value	$ 26	$ 26
$32.00-$39.00
Griffin Stock Option Plan
Exercise prices, low end of range (in dollars per share)		$ 32.00
Exercise prices, high end of range (in dollars per share)		$ 39.00
Outstanding at ending of the year (in shares)	83,075	83,075
Weighted Avg. Exercise Price (in dollars per share)	$ 33.52	$ 33.52
Weighted Avg. Remaining Contractual Life	4 years 1 month 6 days