Stockholders' Equity (Details 3) - 2009 Stock Option Plan $ / shares in Units, $ in Thousands	9 Months Ended
	Aug. 31, 2015 USD ($) $ / shares shares
Griffin Stock Option Plan
Outstanding at ending of the year (in shares) | shares	225,727
Weighted Avg. Exercise Price (in dollars per share)	$ 30.47
Weighted Avg. Remaining Contractual Life	4 years 9 months 18 days
Total Intrinsic Value | $	$ 401
$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) | shares	14,934
Weighted Avg. Exercise Price (in dollars per share)	$ 25.43
Weighted Avg. Remaining Contractual Life	6 years 4 months 24 days
Total Intrinsic Value | $	$ 91
$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) | shares	127,718
Weighted Avg. Exercise Price (in dollars per share)	$ 29.07
Weighted Avg. Remaining Contractual Life	5 years 7 months 6 days
Total Intrinsic Value | $	$ 310
$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) | shares	83,075
Weighted Avg. Exercise Price (in dollars per share)	$ 33.52
Weighted Avg. Remaining Contractual Life	3 years 1 month 6 days