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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Stock-based compensation $ 1,745,134 $ 809,371
Unrealized losses on securities, income tax benefit 21,527 23,214
Unrecognized actuarial gains (losses) on postretirement plans, income tax expense (benefit) 641,789 (491,248)
Station Operating Expenses [Member]    
Stock-based compensation 54,163 112,327
Corporate General and Administrative Expenses [Member]    
Stock-based compensation $ 1,690,971 $ 697,044