Stockholders' Equity - Stock Option Grants, Activity And Expense (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Feb. 28, 2017 USD ($) individual $ / shares shares	Feb. 29, 2016 USD ($) $ / shares shares
Other Disclosures
Number of option holders | individual	32
Compensation expense for stock options
Compensation expense (benefit)	$ 82	$ 71
Related tax benefit (expense)	20	$ 12
Unrecognized compensation expense related to non-vested stock options that will be recognized during future periods
Balance of fiscal 2017	243
Fiscal 2018	296
Fiscal 2019	215
Fiscal 2020	113
Fiscal 2021	33
Fiscal 2022	$ 1
Other Disclosures
Number of options that may be exercised as stock appreciation rights | shares	0
2009 Stock Option Plan
2009 Stock Option Plan
Expiration term	10 years
Granted (in shares) | shares	5,000
Activity under the 2009 Stock Option Plan
Outstanding at beginning of period (in shares) | shares	324,546	225,727
Granted (in shares) | shares	5,000
Outstanding at end of period (in shares) | shares	329,546	225,727
Weighted Avg. Exercise Price
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 29.23	$ 30.47
Granted (in dollars per share) | $ / shares	30.81
Outstanding at end of period (in dollars per share) | $ / shares	$ 29.25	$ 30.47
2009 Stock Option Plan | Non-employee directors
Compensation expense for stock options
Forfeiture rates (as a percent)	0.00%	0.00%
2009 Stock Option Plan | Employee [Member]
2009 Stock Option Plan
Granted (in shares) | shares	5,000
Fair values of stock options granted (in dollars per share) | $ / shares	$ 11.13
Activity under the 2009 Stock Option Plan
Granted (in shares) | shares	5,000
2009 Stock Option Plan | Employee and directors' stock options
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
Annual dividend yield (as a percent)	0.90%
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 [Member]
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 [Member]
Compensation expense for stock options
Forfeiture rates (as a percent)	41.10%	41.10%