Stockholders' Equity - Stock Option Grants, Activity And Expense (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Feb. 28, 2018 USD ($) individual $ / shares shares	Feb. 28, 2017 USD ($) $ / shares shares
Assumptions used in determining the fair value of the stock options granted
Expected volatility (as a percent)		32.70%
Range of risk free interest rate (as a percent)		2.10%
Expected option term (in years)		7 years 6 months
Other Disclosures
Number of option holders | individual	30
Compensation expense for stock options
Compensation expense (benefit) | $	$ 90	$ 82
Related tax benefit (expense) | $	13	$ 20
Unrecognized compensation expense related to non-vested stock options that will be recognized during future periods
Balance of Fiscal 2018 | $	250
Fiscal 2019 | $	234
Fiscal 2020 | $	112
Fiscal 2021 | $	$ 34
2009 Stock Option Plan
2009 Stock Option Plan
Expiration term	10 years
Granted (in shares)		5,000
Assumptions used in determining the fair value of the stock options granted
Annual dividend yield (as a percent)		0.90%
Activity under the 2009 Stock Option Plan
Outstanding at beginning of period (in shares)	333,762	324,546
Granted (in shares)		5,000
Exercised (in shares)	(5,471)
Forfeited (in shares)	(19,779)
Outstanding at end of period (in shares)	308,512	329,546
Weighted Avg. Exercise Price
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 29.22	$ 29.23
Granted (in dollars per share) | $ / shares		30.81
Exercised (in dollars per share) | $ / shares	34.04
Forfeited (in dollars per share) | $ / shares	33.95
Outstanding at end of period (in dollars per share) | $ / shares	$ 28.83	$ 29.25
Other Disclosures
Number of options that may be exercised as stock appreciation rights	0
2009 Stock Option Plan | Employee
2009 Stock Option Plan
Granted (in shares)		5,000
Activity under the 2009 Stock Option Plan
Granted (in shares)		5,000
2009 Stock Option Plan | Non-employee directors
Compensation expense for stock options
Forfeiture rates (as a percent)	0.00%	0.00%
Minimum | 2009 Stock Option Plan
Assumptions used in determining the fair value of the stock options granted
Expected volatility (as a percent)		32.70%
Range of risk free interest rate (as a percent)		2.10%
Expected option term (in years)		7 years 6 months
Minimum | 2009 Stock Option Plan | Executives
Compensation expense for stock options
Forfeiture rates (as a percent)	17.90%	17.90%
Minimum | 2009 Stock Option Plan | Employee
2009 Stock Option Plan
Fair values of stock options granted (in dollars per share) | $ / shares		$ 11.13
Compensation expense for stock options
Forfeiture rates (as a percent)	38.30%	38.30%
Maximum | 2009 Stock Option Plan | Executives
Compensation expense for stock options
Forfeiture rates (as a percent)	22.60%	22.60%
Maximum | 2009 Stock Option Plan | Employee
Compensation expense for stock options
Forfeiture rates (as a percent)	41.10%	41.10%