Broadcast Licenses, Goodwill and Other Intangible Assets (Amortizable intangible assets) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 17,387,000	$ 16,330,000
Accumulated Amortization	16,257,000	15,984,000
Net Amount	1,130,000	346,000
Amortization Expense	270,000	42,000
Customer relationships
Finite-Lived Intangible Assets
Gross Carrying Amount	5,560,000	4,660,000
Accumulated Amortization	4,860,000	4,660,000
Net Amount	700,000
Noncompete Agreements
Finite-Lived Intangible Assets
Gross Carrying Amount	3,861,000	3,861,000
Accumulated Amortization	3,861,000	3,861,000
Favorable lease agreements
Finite-Lived Intangible Assets
Gross Carrying Amount	5,965,000	5,965,000
Accumulated Amortization	5,679,000	5,652,000
Net Amount	286,000	313,000
Other intangibles
Finite-Lived Intangible Assets
Gross Carrying Amount	2,001,000	1,844,000
Accumulated Amortization	1,857,000	1,811,000
Net Amount	$ 144,000	$ 33,000