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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Stock-based compensation     $ 1,734,698 $ 1,778,630
Reclassification of other comprehensive income due to termination of pension plan, income tax benefit       261,358
Station Operating Expenses [Member]        
Stock-based compensation $ 138,704 $ 156,338 346,853 529,802
Corporate General and Administrative Expenses [Member]        
Stock-based compensation $ 463,804 $ 301,116 $ 1,387,845 $ 1,248,828