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Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Stock-based compensation $ 584,574 $ 617,772
Reclassification of other comprehensive income due to termination of pension plan, income tax benefit 261,358  
Station Operating Expenses [Member]    
Stock-based compensation 123,147 152,418
Corporate General and Administrative Expenses [Member]    
Stock-based compensation $ 461,427 $ 465,354