Stockholders' Equity - Stock Option Grants, Activity And Expense (Details) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2016 USD ($) individual $ / shares shares	Aug. 31, 2015 USD ($) $ / shares shares	Aug. 31, 2016 USD ($) individual $ / shares shares	Aug. 31, 2015 USD ($) $ / shares shares
Other Disclosures
Number of option holders | individual	31		31
Compensation expense for stock options
Compensation expense (benefit) | $	$ 71	$ 30	$ 185	$ 192
Related tax benefit (expense) | $	17	$ 8	41	$ 49
Unrecognized compensation expense related to non-vested stock options that will be recognized during future periods
Balance of fiscal 2016 | $	82		82
Fiscal 2017 | $	311		311
Fiscal 2018 | $	279		279
Fiscal 2019 | $	198		198
Fiscal 2020 | $	102		102
Fiscal 2021 | $	$ 28		$ 28
Non-employee directors
2009 Stock Option Plan
Fair values of stock options granted (in dollars per share) | $ / shares			$ 11.30
2009 Stock Option Plan
2009 Stock Option Plan
Expiration term			10 years
Granted (in shares)			109,859	8,282
Assumptions used in determining the fair value of the stock options granted
Expected volatility (as a percent)				40.80%
Range of risk free interest rate (as a percent)				2.00%
Expected option term (in years)				8 years 6 months
Annual dividend yield (as a percent)			0.90%	0.70%
Activity under the 2009 Stock Option Plan
Outstanding at beginning of period (in shares)			225,727	222,001
Granted (in shares)			109,859	8,282
Exercised (in shares)				(3,134)
Forfeited (in shares)			(11,040)	(1,422)
Outstanding at end of period (in shares)	324,546	225,727	324,546	225,727
Weighted Avg. Exercise Price
Outstanding at beginning of period (in dollars per share) | $ / shares			$ 30.47	$ 30.35
Granted (in dollars per share) | $ / shares			26.83	31.38
Exercised (in dollars per share) | $ / shares				25.53
Forfeited (in dollars per share) | $ / shares			30.73	28.12
Outstanding at end of period (in dollars per share) | $ / shares	$ 29.23	$ 30.47	$ 29.23	$ 30.47
2009 Stock Option Plan | Non-employee directors
2009 Stock Option Plan
Granted (in shares)			8,409	8,282
Fair values of stock options granted (in dollars per share) | $ / shares				$ 14.39
Compensation expense for stock options
Forfeiture rates (as a percent)			0.00%	0.00%
Activity under the 2009 Stock Option Plan
Granted (in shares)			8,409	8,282
2009 Stock Option Plan | Employee [Member]
2009 Stock Option Plan
Granted (in shares)			101,450
Activity under the 2009 Stock Option Plan
Granted (in shares)			101,450
Minimum | 2009 Stock Option Plan
Assumptions used in determining the fair value of the stock options granted
Expected volatility (as a percent)			32.90%
Range of risk free interest rate (as a percent)			1.20%
Expected option term (in years)			5 years
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]
2009 Stock Option Plan
Fair values of stock options granted (in dollars per share) | $ / shares			$ 7.51
Compensation expense for stock options
Forfeiture rates (as a percent)			38.30%	38.30%
Maximum | 2009 Stock Option Plan
Assumptions used in determining the fair value of the stock options granted
Expected volatility (as a percent)			41.10%
Range of risk free interest rate (as a percent)			1.50%
Expected option term (in years)			8 years 6 months
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]
2009 Stock Option Plan
Fair values of stock options granted (in dollars per share) | $ / shares			$ 11.65
Compensation expense for stock options
Forfeiture rates (as a percent)			41.10%	41.10%