Stockholders' Equity - Range Of Exercise Prices (Details) - 2009 Stock Option Plan $ / shares in Units, $ in Thousands	9 Months Ended
	Aug. 31, 2020 USD ($) $ / shares shares
2009 Stock Option Plan
Outstanding at ending of the year (in shares) | shares	256,180
Weighted Avg. Exercise Price (in dollars per share)	$ 35.74
Weighted Avg. Remaining Contractual Life	7 years 2 months 12 days
Total Intrinsic Value | $	$ 4,469
$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	110,972
Weighted Avg. Exercise Price (in dollars per share)	$ 26.75
Weighted Avg. Remaining Contractual Life	5 years 4 months 24 days
Total Intrinsic Value | $	$ 2,933
$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	21,978
Weighted Avg. Exercise Price (in dollars per share)	$ 30.02
Weighted Avg. Remaining Contractual Life	4 years 7 months 6 days
Total Intrinsic Value | $	$ 509
$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)	$ 47.00
Outstanding at ending of the year (in shares) | shares	123,230
Weighted Avg. Exercise Price (in dollars per share)	$ 44.84
Weighted Avg. Remaining Contractual Life	9 years 3 months 18 days
Total Intrinsic Value | $	$ 1,027