Stockholders' Equity - Range Of Exercise Prices (Details) - 2009 Stock Option Plan $ / shares in Units, $ in Thousands	6 Months Ended
	May 31, 2017 USD ($) $ / shares shares
2009 Stock Option Plan
Outstanding at ending of the year (in shares) | shares	334,012
Weighted Avg. Exercise Price (in dollars per share)	$ 29.22
Weighted Avg. Remaining Contractual Life	5 years 3 months 18 days
Total Intrinsic Value | $	$ 813
$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	124,793
Weighted Avg. Exercise Price (in dollars per share)	$ 26.67
Weighted Avg. Remaining Contractual Life	8 years 4 months 24 days
Total Intrinsic Value | $	$ 552
$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	128,248
Weighted Avg. Exercise Price (in dollars per share)	$ 29.07
Weighted Avg. Remaining Contractual Life	4 years 7 months 6 days
Total Intrinsic Value | $	$ 261
$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	80,971
Weighted Avg. Exercise Price (in dollars per share)	$ 33.40
Weighted Avg. Remaining Contractual Life	1 year 4 months 24 days