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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Stock-based compensation | $ 750,670 | $ 2,118,718
Unrecognized actuarial gains (losses) on postretirement plans, income tax benefit | 355,662 | 188,505
Station Operating Expenses [Member] |  |
Stock-based compensation | 333,012 | 359,657
Corporate General and Administrative Expenses [Member] |  |
Stock-based compensation | $ 417,658 | $ 1,759,061

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