Stockholders' Equity - Stock Option Grants, Activity And Expense (Details) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	May 31, 2019 USD ($) individual $ / shares shares	May 31, 2018 USD ($) $ / shares shares	May 31, 2019 USD ($) individual $ / shares shares	May 31, 2018 USD ($) $ / shares shares
Other Disclosures
Number of option holders | individual	26		26
Unrecognized compensation expense related to non-vested stock options that will be recognized during future periods
Balance of Fiscal 2019 | $	$ 120		$ 120
Fiscal 2020 | $	157		157
Fiscal 2021 | $	$ 43		$ 43
2009 Stock Option Plan
2009 Stock Option Plan
Expiration term			10 years
Number of options that may be exercised as stock appreciation rights	0		0
Granted (in shares)			5,946	5,195
Assumptions used in determining the fair value of the stock options granted
Expected volatility (as a percent)			30.90%	30.50%
Risk free interest rates (as a percent)			2.30%	3.00%
Expected option term (in years)			8 years 6 months	8 years 6 months
Annual dividend yield (as a percent)			1.20%	1.10%
Compensation expense for stock options
Compensation expense (benefit) | $	$ 94	$ 88	$ 184	$ 178
Related tax benefit (expense) | $	$ 13	$ 13	$ 26	$ 26
Activity under the 2009 Stock Option Plan
Outstanding at beginning of period (in shares)			224,001	333,762
Granted (in shares)			5,946	5,195
Exercised (in shares)			(29,838)	(36,823)
Forfeited (in shares)			(2,788)	(20,279)
Outstanding at end of period (in shares)	197,321	281,855	197,321	281,855
Weighted Avg. Exercise Price
Outstanding at beginning of period (in dollars per share) | $ / shares			$ 28.20	$ 29.22
Granted (in dollars per share) | $ / shares			36.99	38.48
Exercised (in dollars per share) | $ / shares			28.71	32.81
Forfeited (in dollars per share) | $ / shares			35.86	33.78
Outstanding at end of period (in dollars per share) | $ / shares	$ 28.28	$ 28.60	$ 28.28	$ 28.60
2009 Stock Option Plan | Non-employee directors
2009 Stock Option Plan
Granted (in shares)			5,946	5,195
Fair values of stock options granted (in dollars per share) | $ / shares			$ 12.87	$ 14.41
Activity under the 2009 Stock Option Plan
Granted (in shares)			5,946	5,195
2009 Stock Option Plan | Minimum
Compensation expense for stock options
Forfeiture rates (as a percent)	0.00%	0.00%	0.00%	0.00%
2009 Stock Option Plan | Minimum | Executives
Compensation expense for stock options
Forfeiture rates (as a percent)	17.90%	17.90%	17.90%	17.90%
2009 Stock Option Plan | Minimum | Employee
Compensation expense for stock options
Forfeiture rates (as a percent)	38.30%	38.30%	38.30%	38.30%
2009 Stock Option Plan | Maximum
Compensation expense for stock options
Forfeiture rates (as a percent)	2.00%	2.00%	2.00%	2.00%