Stockholders' Equity - Range Of Exercise Prices (Details) - 2009 Stock Option Plan $ / shares in Units, $ in Thousands	6 Months Ended
	May 31, 2019 USD ($) $ / shares shares
2009 Stock Option Plan
Outstanding at begining of the year (in shares) | shares	197,321
Weighted Avg. Exercise Price (in dollars per share)	$ 28.28
Weighted Avg. Remaining Contractual Life	5 years 7 months 6 days
Total Intrinsic Value | $	$ 1,756
$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 begining of the year (in shares) | shares	115,137
Weighted Avg. Exercise Price (in dollars per share)	$ 26.76
Weighted Avg. Remaining Contractual Life	6 years 8 months 12 days
Total Intrinsic Value | $	$ 1,196
$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 begining of the year (in shares) | shares	70,212
Weighted Avg. Exercise Price (in dollars per share)	$ 29.33
Weighted Avg. Remaining Contractual Life	3 years 4 months 24 days
Total Intrinsic Value | $	$ 549
$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 begining of the year (in shares) | shares	11,972
Weighted Avg. Exercise Price (in dollars per share)	$ 36.74
Weighted Avg. Remaining Contractual Life	8 years 7 months 6 days
Total Intrinsic Value | $	$ 11