Stockholders' Equity - Range Of Exercise Prices (Details) - 2009 Stock Option Plan $ / shares in Units, $ in Thousands	9 Months Ended
	Aug. 31, 2018 USD ($) $ / shares shares
2009 Stock Option Plan
Outstanding at ending of the year (in shares) | shares	244,124
Weighted Avg. Exercise Price (in dollars per share)	$ 28.20
Weighted Avg. Remaining Contractual Life	5 years 4 months 24 days
Total Intrinsic Value | $	$ 2,904
$23.00-$28.00
2009 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	118,276
Weighted Avg. Exercise Price (in dollars per share)	$ 26.73
Weighted Avg. Remaining Contractual Life	7 years 3 months 18 days
Total Intrinsic Value | $	$ 1,582
$28.00-$32.00
2009 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	117,034
Weighted Avg. Exercise Price (in dollars per share)	$ 29.09
Weighted Avg. Remaining Contractual Life	3 years 4 months 24 days
Total Intrinsic Value | $	$ 1,289
$32.00-$39.00
2009 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	8,814
Weighted Avg. Exercise Price (in dollars per share)	$ 36.29
Weighted Avg. Remaining Contractual Life	6 years 8 months 12 days
Total Intrinsic Value | $	$ 33