Stockholders' Equity - Stock Option Grants, Activity And Expense (Details) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2017 USD ($) individual $ / shares shares	Aug. 31, 2016 USD ($) $ / shares shares	Aug. 31, 2017 USD ($) individual $ / shares shares	Aug. 31, 2016 USD ($) $ / shares shares
Other Disclosures
Number of option holders | individual	31		31
Compensation expense for stock options
Compensation expense (benefit) | $	$ 90	$ 71	$ 260	$ 185
Related tax benefit (expense) | $	19	$ 17	59	$ 41
Unrecognized compensation expense related to non-vested stock options that will be recognized during future periods
Balance of fiscal 2017 | $	90		90
Fiscal 2018 | $	340		340
Fiscal 2019 | $	234		234
Fiscal 2020 | $	112		112
Fiscal 2021 | $	$ 34		$ 34
2009 Stock Option Plan
2009 Stock Option Plan
Expiration term			10 years
Granted (in shares)			11,570	109,859
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)			324,546	225,727
Granted (in shares)			11,570	109,859
Forfeited (in shares)			(2,354)	(11,040)
Outstanding at end of period (in shares)	333,762	324,546	333,762	324,546
Weighted Avg. Exercise Price
Outstanding at beginning of period (in dollars per share) | $ / shares			$ 29.23	$ 30.47
Granted (in dollars per share) | $ / shares			30.59	26.83
Forfeited (in dollars per share) | $ / shares			36.82	30.73
Outstanding at end of period (in dollars per share) | $ / shares	$ 29.22	$ 29.23	$ 29.22	$ 29.23
Other Disclosures
Number of options that may be exercised as stock appreciation rights	0		0
2009 Stock Option Plan | Non-employee directors
2009 Stock Option Plan
Granted (in shares)			6,570	8,409
Fair values of stock options granted (in dollars per share) | $ / shares			$ 13.49	$ 11.30
Compensation expense for stock options
Forfeiture rates (as a percent)			0.00%	0.00%
Activity under the 2009 Stock Option Plan
Granted (in shares)			6,570	8,409
2009 Stock Option Plan | Employee [Member]
2009 Stock Option Plan
Granted (in shares)			5,000	101,450
Fair values of stock options granted (in dollars per share) | $ / shares			$ 11.13
Activity under the 2009 Stock Option Plan
Granted (in shares)			5,000	101,450
Minimum | 2009 Stock Option Plan
Assumptions used in determining the fair value of the stock options granted
Expected volatility (as a percent)			32.70%	32.90%
Range of risk free interest rate (as a percent)			2.10%	1.20%
Expected option term (in years)			7 years 6 months	5 years
Annual dividend yield (as a percent)			0.80%
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)			39.60%	41.10%
Range of risk free interest rate (as a percent)			2.20%	1.50%
Expected option term (in years)			8 years 6 months	8 years 6 months
Annual dividend yield (as a percent)			0.90%
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%