Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
OPERATING REVENUES
Operating revenues	$ 1,047,000
Leasing	1,495,000	$ 1,586,000
Operating revenues	2,542,000	9,683,000
OPERATING COSTS AND EXPENSES
Leasing	578,000	469,000
General and administrative	831,000	489,000
Share-based compensation	579,000	559,000
Depreciation	439,000	416,000
Total operating costs and expenses	3,367,000	3,555,000
OPERATING INCOME (LOSS)	(825,000)	6,128,000
Pension and other post-retirement expenses	(102,000)	(202,000)
Interest expense	(37,000)	(94,000)
NET INCOME (LOSS)	(964,000)	5,832,000
Pension, net of income taxes of $0	185,000	204,000
COMPREHENSIVE INCOME (LOSS)	$ (779,000)	$ 6,036,000
NET INCOME (LOSS) PER COMMON SHARE--BASIC AND DILUTED (in dollars per share)	$ (0.05)	$ 0.31
Real Estate [Member]
OPERATING REVENUES
Operating revenues	$ 36,000	$ 7,139,000
OPERATING COSTS AND EXPENSES
Operating costs	66,000	736,000
Operating costs	66,000	736,000
Public Utilities [Member]
OPERATING REVENUES
Operating revenues	704,000	676,000
OPERATING COSTS AND EXPENSES
Operating costs	521,000	553,000
Operating costs	521,000	553,000
Resort Amenities and Other [Member]
OPERATING REVENUES
Operating revenues	307,000	282,000
OPERATING COSTS AND EXPENSES
Operating costs	353,000	333,000
Operating costs	$ 353,000	$ 333,000