PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross, Total	$ 179,964	$ 167,421
Less: Accumulated depreciation and amortization	(153,673)	(148,229)
Property and equipment, net	26,291	19,192
Depreciation and Amortization:	9,289	9,741
Land and improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross, Total	$ 4,128	2,372
Property, Plant and Equipment, Estimated Useful Lives	0 years
Buildings
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross, Total	$ 3,241	2,654
Property, Plant and Equipment, Estimated Useful Lives	P31Y
Transmitters and towers [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross, Total	$ 43,466	39,277
Transmitters and towers [Member] \| Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	P15Y
Transmitters and towers [Member] \| Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	7
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross, Total	$ 63,192	59,537
Equipment [Member] \| Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	P7Y
Equipment [Member] \| Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	P3Y
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross, Total	$ 9,397	9,019
Property, Plant and Equipment, Estimated Useful Lives	P6Y
Software and web development [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross, Total	$ 31,337	29,741
Property, Plant and Equipment, Estimated Useful Lives	P3Y
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross, Total	$ 24,727	24,449
Property, Plant and Equipment, Estimated Useful Lives	Lease Term
Construction-in-progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross, Total	$ 476	$ 372
Property, Plant and Equipment, Estimated Useful Lives	0 years

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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