Stockholders' Equity - Range Of Exercise Prices (Details) - 2009 Stock Option Plan $ / shares in Units, $ in Thousands	6 Months Ended
	May 31, 2020 USD ($) $ / shares shares
2009 Stock Option Plan
Outstanding at ending of the year (in shares) | shares	298,346
Weighted Avg. Exercise Price (in dollars per share)	$ 34.74
Weighted Avg. Remaining Contractual Life	6 years 7 months 6 days
Total Intrinsic Value | $	$ 2,295
$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	112,638
Weighted Avg. Exercise Price (in dollars per share)	$ 26.76
Weighted Avg. Remaining Contractual Life	5 years 8 months 12 days
Total Intrinsic Value | $	$ 1,536
$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	62,478
Weighted Avg. Exercise Price (in dollars per share)	$ 29.21
Weighted Avg. Remaining Contractual Life	2 years 1 month 6 days
Total Intrinsic Value | $	$ 698
$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 7 months 6 days
Total Intrinsic Value | $	$ 61