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, 2022	Dec. 31, 2021	Dec. 31, 2020
Broadcast Licenses, Goodwill and Other Intangible Assets
Balance			$ 90,277,000	$ 90,208,000
Acquisitions			30,000	69,000
Impairment charge	$ (1,400,000)	$ (3,800,000)			$ (5,149,000)
Balance			$ 90,307,000	$ 90,277,000	$ 90,208,000