Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
OPERATING REVENUES
Operating revenues			$ 2,449,000
Leasing	$ 1,558,000	$ 1,370,000	3,053,000	$ 2,956,000
Operating revenues	2,960,000	9,336,000	5,502,000	19,019,000
OPERATING COSTS AND EXPENSES
Leasing	706,000	587,000	1,284,000	1,056,000
General and administrative	725,000	586,000	1,556,000	1,075,000
Share-based compensation	320,000	253,000	899,000	812,000
Depreciation	446,000	417,000	885,000	833,000
Total operating costs and expenses	3,391,000	2,634,000	6,758,000	6,189,000
OPERATING INCOME (LOSS)	(431,000)	6,702,000	(1,256,000)	12,830,000
Pension and other postretirement expenses	(102,000)	(202,000)	(204,000)	(404,000)
Interest expense	(37,000)	(19,000)	(74,000)	(113,000)
NET INCOME (LOSS)	(570,000)	6,481,000	(1,534,000)	12,313,000
Pension, net of income taxes of $0	185,000	204,000	370,000	408,000
COMPREHENSIVE INCOME (LOSS)	$ (385,000)	$ 6,685,000	$ (1,164,000)	$ 12,721,000
NET INCOME (LOSS) PER COMMON SHARE --BASIC AND DILUTED (in dollars per share)	$ (0.03)	$ 0.34	$ (0.08)	$ 0.65
Real Estate [Member]
OPERATING REVENUES
Operating revenues	$ 300,000	$ 6,852,000	$ 336,000	$ 13,991,000
OPERATING COSTS AND EXPENSES
Operating costs	443,000	152,000	509,000	888,000
Public Utilities [Member]
OPERATING REVENUES
Operating revenues	810,000	829,000	1,514,000	1,505,000
OPERATING COSTS AND EXPENSES
Operating costs	520,000	426,000	1,041,000	979,000
Resort Amenities and Other [Member]
OPERATING REVENUES
Operating revenues	292,000	285,000	599,000	567,000
OPERATING COSTS AND EXPENSES
Operating costs	$ 231,000	$ 213,000	$ 584,000	$ 546,000