Stockholders' Equity - Stock Option Grants, Activity And Expense (Details) $ / shares in Units, $ in Thousands	12 Months Ended			36 Months Ended
	Nov. 30, 2015 USD ($) Option $ / shares shares	Nov. 30, 2014 USD ($) $ / shares shares	Nov. 30, 2013 USD ($) $ / shares shares	Nov. 30, 2015 USD ($) Option $ / shares shares
Other Disclosures
Number of option holders | Option	15			15
Other Disclosures
Total grant date fair value of options vested	$ 492	$ 664	$ 466
Weighted Avg. Exercise Price
Intrinsic value of options exercised (in dollars)	$ 18	$ 10	$ 114
2009 Stock Option Plan
Griffin Stock Option Plan
Granted (in shares) | shares	8,282	8,532	8,112
Activity under the Griffin Stock Option Plan
Outstanding at beginning of period (in shares) | shares	222,001	239,677	243,841	243,841
Granted (in shares) | shares	8,282	8,532	8,112
Exercised (in shares) | shares	(3,134)	(3,208)	(6,776)
Forfeited (in shares) | shares	(1,422)	(23,000)	(5,500)
Outstanding at end of period (in shares) | shares	225,727	222,001	239,677	225,727
Weighted Avg. Exercise Price
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 30.35	$ 30.35	$ 29.88	$ 29.88
Granted (in dollars per share) | $ / shares	31.38	28.12	29.58
Exercised (in dollars per share) | $ / shares	25.53	24.94	11.81
Forfeited (in dollars per share) | $ / shares	28.12	30.27	31.12
Outstanding at end of period (in dollars per share) | $ / shares	$ 30.47	$ 30.35	$ 30.35	$ 30.47
2009 Stock Option Plan | Minimum | Employees
Other Disclosures
Forfeiture rates (as a percent)				30.30%
2009 Stock Option Plan | Maximum | Employees
Other Disclosures
Forfeiture rates (as a percent)				46.60%
2009 Stock Option Plan | Employee and directors' stock options
Griffin Stock Option Plan
Number of shares authorized | shares	386,926			386,926
Number of shares available for issuance under prior plans included in total shares authorized | shares	161,926			161,926
Expiration term	10 years
Assumptions used in determining the fair value of the stock options granted
Expected volatility (as a percent)	40.80%	38.90%	40.30%
Range of risk free interest rate (as a percent)	2.00%	2.16%	1.33%
Expected option term	8 years 6 months	8 years 6 months	8 years 6 months
Annual dividend yield (as a percent)	0.70%	0.70%	0.70%
Compensation expense for stock options
Compensation expense	$ 230	$ 208	$ 467
Related tax benefit (expense)	$ 61	$ 63	$ 114
Other Disclosures
Forfeiture rates (as a percent)				0.00%
2009 Stock Option Plan | Employee and directors' stock options | Non-employee directors
Griffin Stock Option Plan
Fair values of stock options granted (in dollars per share) | $ / shares	$ 14.39		$ 12.94
Granted (in shares) | shares	8,282	8,532	8,112
Activity under the Griffin Stock Option Plan
Granted (in shares) | shares	8,282	8,532	8,112
2009 Stock Option Plan | Employee and directors' stock options | Minimum
Other Disclosures
Forfeiture rates (as a percent)				22.60%
2009 Stock Option Plan | Employee and directors' stock options | Minimum | Non-employee directors
Griffin Stock Option Plan
Fair values of stock options granted (in dollars per share) | $ / shares		$ 12.42
2009 Stock Option Plan | Employee and directors' stock options | Maximum
Other Disclosures
Forfeiture rates (as a percent)				25.80%
Continuing operations | 2009 Stock Option Plan | Employee and directors' stock options
Compensation expense for stock options
Compensation expense	$ 230	$ 338	$ 415
Related tax benefit (expense)	61	78	109
Discontinued operations. | 2009 Stock Option Plan | Employee and directors' stock options
Compensation expense for stock options
Compensation expense			52
Compensation expense		(130)
Related tax benefit (expense)		$ (15)	$ 5
Nonvested Options
Unrecognized compensation expense related to non-vested stock options that will be recognized during future periods
Fiscal 2016	75			$ 75
Fiscal 2017	$ 19			$ 19