Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Effect of Fourth Quarter Events [Line Items]
Net operating revenue	$ 37,289	$ 36,119	$ 36,438	$ 32,745	$ 35,606	$ 33,831	$ 34,358	$ 29,061		$ 142,591	$ 132,856	$ 133,998
Station operating expenses	25,978	25,459	25,420	24,685	25,868	24,324	24,311	22,765		101,542	97,268	98,424
Corporate G&A	2,915	2,728	2,620	2,717	2,449	2,577	2,583	2,482		10,980	10,091	8,901
Other operating expense (income), net	(8)	(1,393)	8	0	94	433	14	0		1,393	(541)	1,210
Impairment of intangible assets	0	0	0	0	874	0	0	0	$ 1,936	0	874	1,936
Operating income from continuing operations	8,404	9,325	8,390	5,343	6,321	6,497	7,450	3,814		31,462	24,082	25,947
Other (income) expenses:
Interest expense	202	196	189	189	174	229	244	241		776	888	1,064
Write-off of debt issuance costs	0	0	0	0	0	557	0	0		0	557	0
Other (income) expenses	0	0	0	0	0	0	(409)	(8)		0	(417)	(71)
Income before income tax	8,202	9,129	8,201	5,154	6,147	5,711	7,615	3,581		30,686	23,054	24,954
Income tax provision	3,265	3,715	3,390	2,130	2,450	2,599	3,141	1,450		12,500	9,640	10,050
Net income	$ 4,937	$ 5,414	$ 4,811	$ 3,024	$ 3,697	$ 3,112	$ 4,474	$ 2,131		$ 18,186	$ 13,414	$ 14,904
Basic earnings per share	$ 0.84	$ 0.92	$ 0.82	$ 0.52	$ 0.63	$ 0.54	$ 0.77	$ 0.37		$ 3.10	$ 2.31	$ 2.57
Weighted average common shares	5,785	5,755	5,754	5,751	5,732	5,724	5,712	5,710		5,761	5,706	5,700
Diluted earnings per share	$ 0.84	$ 0.92	$ 0.82	$ 0.52	$ 0.63	$ 0.53	$ 0.77	$ 0.36		$ 3.09	$ 2.29	$ 2.55
Weighted average common and common equivalent shares	5,797	5,764	5,763	5,759	5,741	5,752	5,757	5,762		5,771	5,740	5,753