Summary of Significant Accounting Policies (Details 3) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue recognition
Revenues from barter transactions									$ 477,000	$ 424,000	$ 598,000
Percentage of gross broadcast rights fees retained by NASCAR	10.00%								10.00%
Percentage of gross broadcast rights fees recorded as revenue	90.00%								90.00%
Percentage of gross broadcast rights fees payable to the event as part of the awards to the competitors	25.00%								25.00%
Sales taxes included in revenues and expenses									0	0	143,000
Expense recognition
Advertising expenses									1,160,000	1,093,000	1,526,000
Net earnings (loss) per common share - basic:
Net earnings (loss)									2,024,000	4,571,000	(9,185,000)
Allocation to nonvested restricted stock awards									33,000	67,000
Net earnings (loss) available to common stockholders	(4,758,000)	4,158,000	4,903,000	(2,279,000)	(2,356,000)	4,532,000	5,018,000	(2,623,000)	1,991,000	4,504,000	(9,185,000)
Weighted-average shares outstanding									36,252	36,299	36,194
Net earnings (loss) per common share - basic (in dollars per share)	$ (0.13)	$ 0.11	$ 0.13	$ (0.06)	$ (0.07)	$ 0.12	$ 0.14	$ (0.07)	$ 0.05	$ 0.12	$ (0.25)
Net earnings (loss) per common share - diluted:
Net earnings (loss)									2,024,000	4,571,000	(9,185,000)
Allocation to nonvested restricted stock awards									33,000	67,000
Net earnings (loss) available to common stockholders	(4,758,000)	4,158,000	4,903,000	(2,279,000)	(2,356,000)	4,532,000	5,018,000	(2,623,000)	1,991,000	4,504,000	(9,185,000)
Weighted-average shares and dilutive shares outstanding									36,252	36,299	36,194
Net earnings (loss) per common share - diluted (in dollars per share)	$ (0.13)	$ 0.11	$ 0.13	$ (0.06)	$ (0.07)	$ 0.12	$ 0.14	$ (0.07)	$ 0.05	$ 0.12	$ (0.25)
Restricted Stock Awards
Accounting for stock-based compensation
Stock-based compensation expense									291,000	313,000	407,000
Income tax benefits (expense) related to restricted stock awards									$ 56,000	$ (4,000)	$ 32,000