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Summary of Significant Accounting Policies - Revenue recognition (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Revenue recognition        
Revenues from barter transaction providing sponsorship packages in exchange for goods or services $ 239,000 $ 222,000 $ 239,000 $ 222,000
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 $ 592,000 632,000 $ 592,000 632,000
Net earnings per common share - basic and diluted:        
Net earnings 5,203,000 5,066,000 2,798,000 2,723,000
Allocation to nonvested restricted stock awards 82,000 80,000 44,000 43,000
Net earnings available to common stockholders $ 5,121,000 $ 4,986,000 $ 2,754,000 $ 2,680,000
Weighted-average shares outstanding - basic and diluted 36,308,000 36,245,000 36,307,000 36,248,000
Net earnings per common share - basic and diluted $ 0.14 $ 0.14 $ 0.08 $ 0.07
Options outstanding (in shares) 0 0 0 0
Dividends paid $ 0 $ 0 $ 0 $ 0
Restricted Stock        
Net earnings per common share - basic and diluted:        
Stock-based compensation expense 59,000 62,000 245,000 171,000
Income tax benefits related to vesting of restricted stock awards $ 24,000 $ 26,000 $ 119,000 $ 70,000