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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Stock-based compensation $ 1,112,891 $ 1,317,902
Unrealized gain (loss) on securities, income tax expense (benefit) 32,494 (1,770)
Station Operating Expenses [Member]    
Stock-based compensation 110,781 101,362
Corporate General and Administrative Expenses [Member]    
Stock-based compensation $ 1,002,110 $ 1,216,540