Business Operations (Details)			1 Months Ended			3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 21, 2015 item	May. 29, 2014 USD ($)	Jun. 30, 2014 item	Jun. 30, 2013 item	Jul. 31, 2012 item	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2015 USD ($) item	Dec. 31, 2014 USD ($)
Business Operations
Non-refundable deposit received on expected sale of facility | $								$ 1,200,000
Income from assets held for sale | $							$ 606,000	1,033,000
Nashville Superspeedway
Business Operations
Proceeds from sale of facility | $		$ 27,000,000
Non-refundable deposit received on expected sale of facility | $									$ 1,700,000
Additional consideration received that will be applied against the purchase price | $								1,200,000
Income from assets held for sale | $							$ 606,000	1,033,000
Deposits included in accrued expenses | $								$ 1,867,000	$ 1,700,000
Nashville Superspeedway | Scenario Forecast
Business Operations
Deposits included in accrued expenses | $						$ 1,867,000
Dover Facility
Business Operations
Number of events promoted								6
Number of years Firefly Music Festival hosted								4 years
Number of days the Firefly Music Festival is held			4 days	3 days	3 days			3 days
Number of music acts featured in Firefly Music Festival	120		100	70	40			40
Number of options granted to extend rent agreement								2
Number of years each agreement permits to use our facility								5 years
Dover Facility | Maximum
Business Operations
Number of events scheduled to be promoted								2
Dover Facility | NASCAR Sprint Cup Series Events
Business Operations
Number of events scheduled to be promoted								2
Dover Facility | NASCAR Xfinity Series Events
Business Operations
Number of events scheduled to be promoted								2
Dover Facility | NASCAR Camping World Truck Series Events
Business Operations
Number of events scheduled to be promoted								1
Dover Facility | NASCAR K and N Pro Series East Event
Business Operations
Number of events scheduled to be promoted								1