Income Taxes (Details) - USD ($) $ in Thousands			12 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2016	Feb. 28, 2018
Income tax benefit (expense) on continuing operations
Current federal			$ 25	$ (43)	$ 50
Current state and local			(102)	(7)
Deferred federal			(678)	(2,610)	(580)
Deferred state and local			250	(13)	(205)
Total income tax provision			$ (505)	(2,673)	(735)
Income tax rate changes
Federal income tax rate	21.00%	35.00%	22.00%
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
Charges for expected lower realization of state tax benefits					180
Tax effect of exercises and forfeitures of stock options				17	17
Income tax benefit			505	2,673	735
Deferred tax (expense) benefit included in other comprehensive (loss) income
Fair value adjustment of Griffin's cash flow hedges			(797)	(463)	(399)
Mark to market adjustments on Centaur Media plc				23	347
Total other comprehensive income (loss), tax			(797)	(440)	(52)
Differences between income tax benefits at the United States statutory income tax rates and the actual income tax benefits on continuing operations
Tax (provision) benefit at statutory rate			255	(2,555)	(459)
State and local taxes, including valuation allowance, net of federal tax effect			78	(18)	(205)
Permanent items			(24)	(41)	(35)
Federal rate change under TCJA			(1,001)
Other			187	(59)	(36)
Total income tax provision			(505)	(2,673)	(735)
Deferred tax assets:
Federal net operating loss carryforwards			3,657	3,797
Deferred revenue			2,402	3,841
State net operating loss carryforwards			2,236	1,366
Retirement benefit plans			1,416	1,936
Non-qualified stock options			480	970
Cash flow hedges				159
Other			220	226
Total deferred tax assets			10,411	12,295
Valuation allowance			(2,190)	(1,363)
Net deferred tax assets			8,221	10,932
Deferred tax liabilities:
Real estate assets			(4,331)	(7,199)
Deferred rent			(1,018)	(1,291)
Cash flow hedges			(674)
Other			(642)	(538)
Total deferred tax liabilities			(6,665)	(9,028)
Net total deferred tax assets			1,556	1,904
Operating loss carryforwards
Accrual for uncertain income tax positions			0
State
Income Taxes, additional disclosures
Effect on income tax benefit for valuation allowance			681	238	1,798
Operating loss carryforwards
Net operating loss carryforwards			$ 650
State | Minimum
Operating loss carryforwards
Expiration period of operating loss carryforwards			11 years
State | Maximum
Operating loss carryforwards
Expiration period of operating loss carryforwards			20 years
Federal
Income tax benefit (expense) on continuing operations
Total income tax provision			$ 146		629
Income Taxes, additional disclosures
Income tax benefit			(146)		(629)
Effect on income tax benefit for valuation allowance				$ 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 provision			146		$ 629
Operating loss carryforwards
Net operating loss carryforwards			$ 15,862
Federal | Minimum
Operating loss carryforwards
Expiration period of operating loss carryforwards			14 years
Federal | Maximum
Operating loss carryforwards
Expiration period of operating loss carryforwards			20 years
ASU 2016-09
Deferred tax assets:
Non-qualified stock options						$ 879