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Property and Equipment - Summary of Property and Equipment (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 88,759,477	$ 87,975,570
Less accumulated depreciation and amortization	(35,091,927)	(34,161,968)
Property and equipment, net	53,667,550	53,813,602
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	13,342,547	13,471,312
Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	30,416,904	22,114,228
Broadcast Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	33,212,926	35,223,342
Transportation Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,269,019	2,379,818
Estimated useful lives (years)	5 years
Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 6,907,944	6,061,531
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,610,137	$ 8,725,339
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

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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