Summary of Significant Accounting Policies (Details 2) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenue recognition
Revenues from barter transactions	$ 251,000	$ 224,000	$ 251,000	$ 224,000
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%
Expense recognition
Advertising expenses	$ 634,000	668,000	$ 634,000	668,000
Net earnings per common share - basic and diluted:
Net earnings	5,494,000	4,844,000	2,890,000	2,726,000
Allocation to nonvested restricted stock awards	86,000	77,000	45,000	43,000
Net earnings available to common stockholders	$ 5,408,000	$ 4,767,000	$ 2,845,000	$ 2,683,000
Weighted-average shares outstanding - basic and diluted	36,157,000	36,042,000	36,155,000	36,052,000
Net earnings per common share - basic and diluted	$ 0.15	$ 0.13	$ 0.08	$ 0.07
Options outstanding (in shares)	0	0	0	0
Dividends paid	$ 0	$ 0	$ 0	$ 0
Restricted Stock
Accounting for stock-based compensation
Stock-based compensation expense	60,000	58,000	196,000	164,000
Income tax benefits related to restricted stock awards	$ 23,000	$ 23,000	$ 78,000	$ 67,000