Summary of Significant Accounting Policies (Details 2) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenue recognition
Revenues from barter transactions									$ 424,000	$ 598,000	$ 626,000
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										143,000	156,000
Expense recognition
Advertising expenses									1,093,000	1,526,000	1,637,000
Net earnings (loss) per common share - basic:
Net earnings (loss)									4,571,000	(9,185,000)	(8,173,000)
Allocation to nonvested restricted stock awards									67,000
Net earnings (loss) available to common stockholders	(2,356,000)	4,532,000	5,018,000	(2,623,000)	5,061,000	(14,581,000)	3,901,000	(3,566,000)	4,504,000	(9,185,000)	(8,173,000)
Weighted-average shares outstanding									36,299,000	36,194,000	36,095,000
Net earnings (loss) per common share - basic (in dollars per share)	$ (0.07)	$ 0.12	$ 0.14	$ (0.07)	$ 0.14	$ (0.40)	$ 0.11	$ (0.10)	$ 0.12	$ (0.25)	$ (0.23)
Net earnings (loss) per common share - diluted:
Net earnings (loss)									4,571,000	(9,185,000)	(8,173,000)
Allocation to nonvested restricted stock awards									67,000
Net earnings (loss) available to common stockholders	(2,356,000)	4,532,000	5,018,000	(2,623,000)	5,061,000	(14,581,000)	3,901,000	(3,566,000)	4,504,000	(9,185,000)	(8,173,000)
Weighted-average shares outstanding									36,299,000	36,194,000	36,095,000
Weighted-average shares and dilutive shares outstanding									36,299,000	36,194,000	36,095,000
Net earnings (loss) per common share - diluted (in dollars per share)	$ (0.07)	$ 0.12	$ 0.14	$ (0.07)	$ 0.14	$ (0.40)	$ 0.11	$ (0.10)	$ 0.12	$ (0.25)	$ (0.23)
Options excluded from the computation of diluted earnings per share due to anti-dilutive effect (in shares)										1,000	293,000
Restricted Stock Awards
Accounting for stock-based compensation
Stock-based compensation expense									313,000	407,000	662,000
Income tax (expense) benefit related to restricted stock awards									$ (4,000)	$ 32,000	$ 127,000