Income Taxes (Details) - USD ($) $ in Thousands			3 Months Ended	12 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Feb. 28, 2018	Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2017
Income tax benefit (expense) on continuing operations
Current federal					$ 25	$ (43)
Current state and local				$ (88)	(102)	(7)
Deferred federal				(511)	(678)	(2,610)
Deferred state and local				812	250	(13)
Total income tax benefit (provision)				213	$ (505)	$ (2,673)
Income tax rate changes
Federal income tax rate	21.00%	35.00%	21.00%		22.00%	35.00%
Impact of lower statutory rate applied to deferred tax assets and deferred tax liabilities resulted for the re-measurement of deferred tax assets and liabilities					$ 1,001
Income Taxes, additional disclosures
Tax effect of exercises and forfeitures of stock options						$ 17
Income tax benefit				(213)	505	2,673
Effect on income tax benefit for valuation allowance				$ 873
Number of consecutive years				4 years
Deferred tax (expense) benefit included in other comprehensive (loss) income
Fair value adjustment of Griffin's cash flow hedges				$ 1,586	(797)	(463)
Mark to market adjustments on Centaur Media plc						23
Total income tax benefit (expense) included in other comprehensive (loss) income				1,586	(797)	(440)
Differences between income tax benefits at the United States statutory income tax rates and the actual income tax benefits on continuing operations
Tax benefit (provision) at statutory rate				(726)	255	(2,555)
State and local taxes, including valuation allowance, net of federal tax effect				737	78	(18)
Permanent items				44	(24)	(41)
Federal rate change under TCJA					(1,001)
Other				158	187	(59)
Total income tax benefit (provision)				213	(505)	(2,673)
Deferred tax assets:
Federal net operating loss carryforwards				2,759	3,657
Deferred revenue				2,372	2,402
State net operating loss carryforwards				2,087	2,236
Retirement benefit plans				1,521	1,416
Cash flow hedges				424	480
Non-qualified stock options				938
Other				181	220
Total deferred tax assets				10,282	10,411
Valuation allowance				(1,462)	(2,190)
Net deferred tax assets				8,820	8,221
Deferred tax liabilities:
Real estate assets				(4,274)	(4,331)
Deferred rent				(956)	(1,018)
Cash flow hedges					(674)
Other				(309)	(642)
Total deferred tax liabilities				(5,539)	(6,665)
Net total deferred tax assets				3,281	1,556
Operating loss carryforwards
Accrual for uncertain income tax positions				0
State
Income Taxes, additional disclosures
Effect on income tax benefit for valuation allowance				921	681	238
Operating loss carryforwards
Net operating loss carryforwards				$ 11,217
State | Minimum
Operating loss carryforwards
Expiration period of operating loss carryforwards				11 years
State | Maximum
Operating loss carryforwards
Expiration period of operating loss carryforwards				19 years
Federal
Income tax benefit (expense) on continuing operations
Total income tax benefit (provision)				$ (193)	146	(87)
Income Taxes, additional disclosures
Income tax benefit				193	(146)	87
Differences between income tax benefits at the United States statutory income tax rates and the actual income tax benefits on continuing operations
Total income tax benefit (provision)				(193)	$ 146	$ (87)
Operating loss carryforwards
Net operating loss carryforwards				$ 12,363
Federal | Minimum
Operating loss carryforwards
Expiration period of operating loss carryforwards				15 years
Federal | Maximum
Operating loss carryforwards
Expiration period of operating loss carryforwards				19 years
ASU 2016-09
Deferred tax assets:
Non-qualified stock options			$ 879