CONSOLIDATED STATEMENTS OF EARNINGS AND COMPREHENSIVE INCOME - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues:
Revenues	$ 47,016,000	$ 46,742,000	$ 45,873,000
Expenses:
Operating and marketing	29,277,000	28,764,000	28,197,000
General and administrative	7,310,000	7,347,000	7,433,000
Depreciation	3,285,000	3,566,000	3,433,000
Costs to remove long-lived assets		286,000	203,000
Total expenses	39,872,000	39,963,000	39,266,000
Gain (loss) on sale of land	2,413,000
Operating earnings	9,557,000	6,779,000	6,607,000
Interest expense, net	(62,000)	(169,000)	(199,000)
Provision for contingent obligation	(424,000)	(158,000)	(75,000)
Other (expense) income	(4,000)	85,000	57,000
Earnings before income taxes	9,067,000	6,537,000	6,390,000
Income tax (expense) benefit	(2,178,000)	1,889,000	(2,589,000)
Net earnings	6,889,000	8,426,000	3,801,000
Change in pension net actuarial loss and prior service cost, net of income taxes	155,000	(70,000)	(279,000)
Unrealized gain on equity investments, net of income taxes		22,000	8,000
Comprehensive income	$ 7,044,000	$ 8,378,000	$ 3,530,000
Net earnings per common share (Note 2):
Basic (in dollars per share)	$ 0.19	$ 0.23	$ 0.10
Diluted (in dollars per share)	$ 0.19	$ 0.23	$ 0.10
Admissions
Revenues:
Revenues	$ 5,694,000	$ 6,657,000	$ 6,937,000
Event-related
Revenues:
Revenues	8,410,000	8,303,000	8,264,000
Broadcasting
Revenues:
Revenues	32,905,000	31,775,000	30,658,000
Other
Revenues:
Revenues	$ 7,000	$ 7,000	$ 14,000