Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended														12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	[1]	Dec. 31, 2016	[1]	Sep. 30, 2016	[1]	Jun. 30, 2016	[1]	Mar. 31, 2016	[1]	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Effect of Fourth Quarter Events [Line Items]
Net operating revenue	$ 31,464	$ 30,269	$ 30,261	$ 26,155		$ 30,747		$ 29,878		$ 30,866		$ 27,464			$ 118,149	$ 118,955	$ 111,792
Station operating expenses	23,238	21,755	21,426	21,340		22,042		21,775		21,842		21,140			87,759	86,799	83,188
Corporate G&A	2,782	3,132	2,880	2,863		2,915		2,728		2,620		2,717			11,657	10,980	10,091
Other operating expense (income), net	124	(127)	79	(21)		37		(1,393)		8		(3)			(55)	1,351	(509)
Impairment of intangible assets	1,449	0	0	0		0		0		0		0		$ 874	1,449	0	874
Operating income from continuing operations	3,871	5,509	5,876	1,973		5,753		6,768		6,396		3,610			17,229	22,527	17,130
Other (income) expenses:
Interest expense	212	254	229	208		196		187		182		179			903	744	855
Income from continuing operations before income taxes	3,659	5,255	5,647	1,765		5,557		6,581		6,214		3,431			17,024	22,598
Income tax provision	(11,200)	2,290	2,272	718		2,208		2,678		2,569		1,418			(5,920)	8,873	6,572
Income from continuing operations, net of tax	14,859	2,965	3,375	1,047		3,349		3,903		3,645		2,013			22,246	12,910	9,146
Income (loss) from discontinued operations, net of tax	(30)	30,451	1,159	891		1,588		1,511		1,166		1,011			32,471	5,276	4,268
Net income	$ 14,829	$ 33,416	$ 4,534	$ 1,938		$ 4,937		$ 5,414		$ 4,811		$ 3,024			$ 54,717	$ 18,186	$ 13,414
Basic earnings per share
From continuing operations	$ 2.52	$ 0.50	$ 0.57	$ 0.18		$ 0.57		$ 0.66		$ 0.62		$ 0.35			$ 3.77	$ 2.20	$ 1.58
From discontinued operations	(0.01)	5.16	0.20	0.15		0.27		0.26		0.20		0.17			5.50	0.90	0.73
Basic earnings per share	$ 2.51	$ 5.66	$ 0.77	$ 0.33		$ 0.84		$ 0.92		$ 0.82		$ 0.52			$ 9.27	$ 3.1	$ 2.31
Weighted average common shares	5,815	5,807	5,803	5,795		5,785		5,755		5,754		5,751			5,803	5,761	5,706
Diluted earnings per share
From continuing operations	$ 2.52	$ 0.50	$ 0.57	$ 0.18		$ 0.57		$ 0.66		$ 0.61		$ 0.35			$ 3.77	$ 2.19	$ 1.56
From discontinued operations	(0.01)	5.16	0.20	0.15		0.27		0.26		0.20		0.17			5.50	0.90	0.73
Diluted earnings per share	$ 2.51	$ 5.66	$ 0.77	$ 0.33		$ 0.84		$ 0.92		$ 0.81		$ 0.52			$ 9.27	$ 3.09	$ 2.29
Weighted average common and common equivalent shares	5,815	5,807	5,806	5,808		5,797		5,764		5,763		5,759			5,807	5,771	5,740

[1] Certain prior year amounts and March 31, 2017 quarterly data have been reclassified to conform with current presentation.