INCOME TAXES - Composition of our deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Pension costs	$ 165	$ 602
Charitable contributions	21	22
Net operating loss carry forwards	61,124	53,901
Depreciation (including air rights)	5,035	5,756
Lease liability	650	0
Other	93	141
Deferred gain on sale	0	4,987
Investment in joint venture	382	355
Accrued expenses	80	178
Total deferred tax assets	67,550	65,942
Valuation allowance	(63,709)	(62,127)
Deferred tax asset after valuation allowance	3,841	3,815
Deferred tax liabilities:
Intangibles	(3,242)	(3,815)
Right-of-use asset	(599)	0
Total deferred tax liabilities	(3,841)	(3,815)
Net deferred tax assets	0	0
Current deferred tax assets	0	0
Long-term deferred tax assets	0	0
Total deferred tax assets	$ 0	$ 0