Property and Equipment (Details) - USD ($)	1 Months Ended	3 Months Ended				12 Months Ended
	Jan. 31, 2019	Sep. 30, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property and equipment
Gross			$ 110,787,000			$ 111,179,000	$ 110,787,000
Less accumulated depreciation			(59,787,000)			(63,042,000)	(59,787,000)
Net			51,000,000			48,137,000	51,000,000
Proceeds from sale of land						4,945,000
Loss on sale of land						(2,413,000)
Fair value of land			2,455,000			531,000	2,455,000
Capitalized costs charged to depreciation			186,000
Depreciation						3,285,000	3,566,000	$ 3,433,000
Costs to remove long-lived assets				$ 286,000	$ 203,000		286,000	203,000
Parcel of land near St. Louis | Assets held for sale
Property and equipment
Proceeds from sale of land	$ 531,000
Loss on sale of land		$ 99,000				99,000
Fair value of land						531,000
Land
Property and equipment
Gross			15,916,000			15,286,000	15,916,000
Facilities
Property and equipment
Gross			86,282,000			86,725,000	86,282,000
Furniture, fixtures and equipment
Property and equipment
Gross			8,490,000			8,893,000	8,490,000
Construction in progress
Property and equipment
Gross			$ 99,000			$ 275,000	$ 99,000
Track Related Assets
Property and equipment
Depreciation								$ 208,000