Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, shares in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Quarterly Results of Operations (Unaudited)
Net operating revenue	$ 30,125,000	$ 29,980,000	$ 29,821,000	$ 24,967,000	$ 29,151,000	$ 28,845,000	$ 28,046,000	$ 22,301,000			$ 114,893,000	$ 108,343,000	$ 95,813,000
Station operating expense	22,888,000	22,295,000	21,786,000	20,568,000	21,615,000	21,690,000	21,017,000	18,923,000			87,537,000	83,245,000	81,586,000
Corporate G&A	2,330,000	6,667,000	2,609,000	2,694,000	2,570,000	2,538,000	2,494,000	2,438,000			14,300,000	10,040,000	11,574,000
Other operating expense (income), net	(17,000)	(37,000)	45,000	(5,000)	32,000	(2,000)	(80,000)	57,000			(14,000)	7,000	(1,247,000)
Impairment of broadcast licenses									$ 1,400,000	$ 3,800,000			5,149,000
Operating income (loss)	4,924,000	1,055,000	5,381,000	1,710,000	4,934,000	4,619,000	4,615,000	883,000			13,070,000	15,051,000	(1,249,000)
Other (income) expenses:
Interest expense	34,000	32,000	32,000	32,000	66,000	73,000	72,000	73,000			130,000	284,000	340,000
Interest (income)	(223,000)	(134,000)	(49,000)	(4,000)	(2,000)	(4,000)	(4,000)	(6,000)			(410,000)	(16,000)	(148,000)
Other (income) expense	(616,000)	(34,000)		(2,000)	(52,000)	(279,000)	(31,000)	(272,000)			(652,000)	(634,000)	(233,000)
Income before income taxes	5,729,000	1,191,000	5,398,000	1,684,000	4,922,000	4,829,000	4,578,000	1,088,000			14,002,000	15,417,000	(1,208,000)
Income tax provision (benefit)	1,450,000	1,295,000	1,575,000	480,000	1,230,000	1,375,000	1,325,000	330,000			$ 4,800,000	$ 4,260,000	$ 705,000
Net income (loss)	$ 4,279,000	$ (104,000)	$ 3,823,000	$ 1,204,000	$ 3,692,000	$ 3,454,000	$ 3,253,000	$ 758,000
Basic earnings (loss) per share	$ 0.70	$ (0.01)	$ 0.63	$ 0.20	$ 0.60	$ 0.58	$ 0.54	$ 0.13			$ 1.52	$ 1.85	$ (0.32)
Weighted average common shares	6,013	5,961	5,952	5,948	5,922	5,917	5,917	5,913			5,973	5,917	5,871
Diluted earnings (loss) per share	$ 0.70	$ (0.01)	$ 0.63	$ 0.20	$ 0.60	$ 0.58	$ 0.54	$ 0.13			$ 1.52	$ 1.85	$ (0.32)
Weighted average common and common equivalent shares	6,013	5,961	5,952	5,948	5,922	5,917	5,917	5,913			5,973	5,917	5,871