Business Operations (Details) (USD $)	3 Months Ended	6 Months Ended	3 Months Ended		3 Months Ended	6 Months Ended			6 Months Ended						1 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Sep. 30, 2011 Nashville Superspeedway	Jun. 30, 2012 Nashville Superspeedway	Jun. 30, 2012 Nashville Superspeedway Variable Rate Tax Exempt Infrastructure Revenue Bonds, Series 1999	Jun. 30, 2012 Nashville Superspeedway Variable Rate Tax Exempt Infrastructure Revenue Bonds, Series 1999	Aug. 03, 2011 NASCAR Nationwide Series events Nashville Superspeedway item	Aug. 03, 2011 NASCAR Camping World Truck Series events Nashville Superspeedway item	Jun. 30, 2012 Dover facility item	Jun. 30, 2012 Dover facility NASCAR Sprint Cup Series events item	Jun. 30, 2012 Dover facility NASCAR Nationwide Series events item	Jun. 30, 2012 Dover facility NASCAR Camping World Truck Series events item	Jun. 30, 2012 Dover facility NASCAR K&N Pro Series East event item	Jun. 30, 2012 Gateway facility acre	Jan. 31, 2012 Memphis Motorsports Park facility
Business Operations
Number of events scheduled to be promoted									6	2	2	1	1
Number of events for which 2012 sanction agreements will not be sought							2	2
Severance costs			$ 150,000
Provision for contingent obligation	249,000	289,000	2,250,000
Reduction in the provision for contingent obligation due to change in interest rates					249,000	284,000
Reserve of contingent obligation				1,965,000	1,965,000	1,965,000
Area of undeveloped land owned near the facility (in acres)														120
Net proceeds after closing costs from sale of facility and all personal property at the facility															$ 2,000,000