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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Stock-based compensation     $ 1,132,190 $ 1,321,176
Reclassification of other comprehensive income due to termination of pension plan, income tax benefit     261,358  
Station Operating Expenses [Member]        
Stock-based compensation $ 85,002 $ 221,046 208,149 373,464
Corporate General and Administrative Expenses [Member]        
Stock-based compensation $ 462,614 $ 482,358 $ 924,041 $ 947,712