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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