CONSOLIDATED STATEMENTS OF EARNINGS AND COMPREHENSIVE INCOME - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues:
Revenues	$ 38,543,000	$ 45,963,000	$ 47,016,000
Expenses:
Operating and marketing	25,221,000	29,241,000	29,277,000
General and administrative	7,676,000	7,524,000	7,310,000
Depreciation	3,046,000	4,353,000	3,285,000
Costs to remove long-lived assets	341,000	1,170,000
Total expenses	36,284,000	42,288,000	39,872,000
Gain on sale of land	4,843,000	4,325,000	2,413,000
Operating earnings	7,102,000	8,000,000	9,557,000
Interest (expense) income, net	(35,000)	22,000	(62,000)
Benefit (provision) for contingent obligation	171,000	(1,005,000)	(424,000)
Other income (expense), net	182,000	269,000	(4,000)
Earnings before income taxes	7,420,000	7,286,000	9,067,000
Income tax benefit (expense)	62,000	(1,786,000)	(2,178,000)
Net earnings	7,482,000	5,500,000	6,889,000
Change in pension net actuarial loss and prior service cost, net of income taxes	(94,000)	(333,000)	155,000
Comprehensive income	$ 7,388,000	$ 5,167,000	$ 7,044,000
Net earnings per common share (Note 2):
Basic (in dollars per share)	$ 0.21	$ 0.15	$ 0.19
Diluted (in dollars per share)	$ 0.21	$ 0.15	$ 0.19
Admissions
Revenues:
Revenues		$ 4,968,000	$ 5,694,000
Event-related
Revenues:
Revenues	$ 2,885,000	6,713,000	8,410,000
Broadcasting
Revenues:
Revenues	35,646,000	34,267,000	32,905,000
Other
Revenues:
Revenues	$ 12,000	$ 15,000	$ 7,000