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Property and Equipment - Summary of Property and Equipment (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 89,394,457 $ 86,189,361
Less accumulated depreciation and amortization (31,640,811) (26,870,428)
Property and equipment, net 57,753,646 59,318,933
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 18,895,107 18,904,830
Buildings and improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 22,239,322 20,299,377
Broadcast Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 37,939,156 35,748,619
Transportation Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 2,228,450 2,043,463
Estimated useful lives (years) 5 years  
Office Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 5,939,184 5,696,843
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 2,153,238 $ 3,496,229
Minimum [Member] | Buildings and improvements [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives (years) 15 years  
Minimum [Member] | Broadcast Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives (years) 5 years  
Minimum [Member] | Office Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives (years) 5 years  
Maximum [Member] | Buildings and improvements [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives (years) 30 years  
Maximum [Member] | Broadcast Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives (years) 15 years  
Maximum [Member] | Office Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful lives (years) 10 years