CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Expenses:
Operating and marketing	$ 1,151,000	$ 1,054,000
General and administrative	1,955,000	2,020,000
Depreciation	878,000	821,000
Costs to remove long-lived assets		286,000
Total expenses	3,984,000	4,181,000
Gain on sale of land	2,512,000
Operating loss	(1,246,000)	(4,071,000)
Interest expense, net	(40,000)	(48,000)
Provision for contingent obligation	(67,000)	(41,000)
Other income	4,000	52,000
Loss before income taxes	(1,349,000)	(4,108,000)
Income tax benefit	357,000	1,703,000
Net loss	(992,000)	(2,405,000)
Change in net actuarial loss and prior service cost, net of income taxes	27,000	25,000
Unrealized loss on equity investments, net of income taxes		(3,000)
Comprehensive loss	$ (965,000)	$ (2,383,000)
Net loss per common share:
Basic (in dollars per share)	$ (0.03)	$ (0.07)
Diluted (in dollars per share)	$ (0.03)	$ (0.07)
Event-related
Revenues:
Revenues	$ 226,000	$ 110,000