Broadcast Licenses, Goodwill and Other Intangible Assets (Changes to broadcast licenses) (Details) - USD ($)	3 Months Ended			12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2020
Broadcast Licenses, Goodwill and Other Intangible Assets
Balance				$ 90,208,000	$ 95,311,000
Acquisitions				69,000	46,000
Impairment charge	$ (1,392,000)	$ (3,757,000)	$ 0		(5,149,000)
Balance			$ 95,311,000	$ 90,277,000	$ 90,208,000