Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	[1]	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effect of Fourth Quarter Events [Line Items]
Net operating revenue	$ 32,938	$ 31,648	$ 32,234	$ 28,009	$ 31,464	$ 30,269	$ 30,261	$ 26,155		$ 124,829	$ 118,149	$ 118,955
Station operating expenses	23,761	23,429	23,140	23,397	23,238	21,755	21,426	21,340		93,727	87,759	86,799
Corporate G&A	3,154	2,813	2,848	2,544	2,782	3,132	2,880	2,863		11,359	11,657	10,980
Other operating expense (income), net	14	85	213	(251)	124	(127)	79	(21)		(61)	(55)	1,351
Impairment of intangible assets	0	0	0	0	1,449	0	0	0		0	1,449	0
Operating income from continuing operations	6,009	5,321	6,033	2,319	3,871	5,509	5,876	1,973		19,682	17,229	22,527
Other (income) expenses:
Interest expense	229	243	255	219	212	254	229	208		946	903	744
Interest (income)	(187)	(167)	(188)	(89)	0	0	0	0
Other (income) expenses	2	(25)	0	0	0	0	0	0
Income from continuing operations before income taxes	5,965	5,270	5,966	2,189	3,659	5,255	5,647	1,765		20,202	17,898
Income tax provision (benefit)	1,670	1,575	1,795	660	(11,200)	2,290	2,272	718		5,700	(5,920)	8,873
Income from continuing operations, net of tax	4,295	3,695	4,171	1,529	14,859	2,965	3,375	1,047		13,690	22,246	12,910
Income (loss) from discontinued operations, net of tax	0	0	0	0	(30)	30,451	1,159	891		0	32,471	5,276
Net income	$ 4,295	$ 3,695	$ 4,171	$ 1,529	$ 14,829	$ 33,416	$ 4,534	$ 1,938		$ 13,690	$ 54,717	$ 18,186
Basic earnings (loss) per share
From continuing operations	$ 0.72	$ 0.62	$ 0.70	$ 0.26	$ 2.52	$ 0.50	$ 0.57	$ 0.18		$ 2.30	$ 3.77	$ 2.20
From discontinued operations	0	0	0	0	(0.01)	5.16	0.20	0.15		0	5.50	0.90
Basic earnings per share	$ 0.72	$ 0.62	$ 0.70	$ 0.26	$ 2.51	$ 5.66	$ 0.77	$ 0.33		$ 2.30	$ 9.27	$ 3.10
Weighted average common shares	5,820	5,822	5,834	5,842	5,815	5,807	5,803	5,795		5,829	5,803	5,761
Diluted earnings (loss) per share
From continuing operations	$ 0.72	$ 0.62	$ 0.70	$ 0.26	$ 2.52	$ 0.50	$ 0.57	$ 0.18		$ 2.30	$ 3.77	$ 2.19
From discontinued operations	0	0	0	0	(0.01)	5.16	0.20	0.15		0	5.50	0.90
Diluted earnings per share	$ 0.72	$ 0.62	$ 0.70	$ 0.26	$ 2.51	$ 5.66	$ 0.77	$ 0.33		$ 2.30	$ 9.27	$ 3.09
Weighted average common and common equivalent shares	5,820	5,822	5,834	5,842	5,815	5,807	5,806	5,808		5,829	5,807	5,771

[1] March 31, 2017 quarterly data have been reclassified to conform with current presentation.