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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

X

- Definition

Amount of tax expense (benefit) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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- Definition

Amount of noncash expense for share-based payment arrangement.

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-Topic 230
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