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Acquisitions and Dispositions - Schedule of Purchase Price Allocation (Detail) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 28,596,547 | $ 25,377,447 | $ 15,275,264
WDMK-FM [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Property and equipment | 432,588 |  |
FCC license | 12,891,117 |  |
Other intangibles | 176,295 |  |
Net assets acquired | 13,500,000 |  |
WXTU-FM [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Property and equipment | 357,734 |  |
FCC license | 27,346,200 |  |
Goodwill | 10,102,183 |  |
Other intangibles | 193,883 |  |
Net assets acquired | $ 38,000,000 |  |

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