Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Property Plant and Equipment, Gross	$ 151,553,000	$ 148,265,000
Accumulated depreciation	(99,646,000)	(96,860,000)
Net property and equipment	51,907,000	51,405,000
Continuing Operations
Property, Plant and Equipment [Line Items]
Depreciation	5,013,000	5,013,000
Land and Land Improvements
Property, Plant and Equipment [Line Items]
Property Plant and Equipment, Gross	15,524,000	15,239,000
Building
Property, Plant and Equipment [Line Items]
Property Plant and Equipment, Gross	$ 41,292,000	40,460,000
Estimated Useful Life	31 years 6 months
Towers And Antennae
Property, Plant and Equipment [Line Items]
Property Plant and Equipment, Gross	$ 27,969,000	27,145,000
Towers And Antennae | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	7 years
Towers And Antennae | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	15 years
Equipment
Property, Plant and Equipment [Line Items]
Property Plant and Equipment, Gross	$ 55,647,000	54,747,000
Equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	15 years
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Property Plant and Equipment, Gross	$ 8,314,000	7,907,000
Furniture and Fixtures | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	7 years
Furniture and Fixtures | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	20 years
Vehicles
Property, Plant and Equipment [Line Items]
Property Plant and Equipment, Gross	$ 2,807,000	$ 2,767,000
Estimated Useful Life	5 years