Quarterly Results of Operations (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net operating revenue	$ 35,541	$ 32,409	$ 32,986	$ 29,323	$ 32,234	$ 32,027	$ 32,764	$ 28,248	$ 130,259	$ 125,273	$ 125,833
Station operating expense	23,590	22,379	21,959	22,360	22,840	22,939	23,016	22,134	90,288	90,929	90,335
Corporate G&A	2,161	1,910	1,940	1,949	1,736	1,965	1,949	1,940	7,960	7,590	7,274
Operating income from continuing operations	9,790	8,120	9,087	5,014	7,658	7,123	7,799	4,174	32,011	26,754	28,224
Other (income) expenses:
Interest expenses	366	381	458	528	583	646	1,034	1,157	1,733	3,420	5,622
Write-off debt issuance costs	0	0	0	0	0	0	1,326	0	0	1,326	0
Other	144	145	(8)	(2)	524	27	(95)	63	279	519	(3,481)
Income from continuing operations before income tax	9,280	7,594	8,637	4,488	6,551	6,450	5,534	2,954	29,999	21,489	26,083
Income tax provision	3,489	3,227	3,438	1,785	2,674	2,473	2,251	1,206	11,939	8,604	10,619
Income from continuing operations, net of tax	5,791	4,367	5,199	2,703	3,877	3,977	3,283	1,748	18,060	12,885	15,464
Income (loss) from discontinued operations, net of tax	(31)	(39)	(67)	2	228	(283)	(113)	(86)	(135)	(254)	(328)
Net income	$ 5,760	$ 4,328	$ 5,132	$ 2,705	$ 4,105	$ 3,694	$ 3,170	$ 1,662	$ 17,925	$ 12,631	$ 15,136
Basic earnings (loss) per share:
From continuing operations	$ 1.02	$ 0.77	$ 0.92	$ 0.48	$ 0.69	$ 0.70	$ 0.58	$ 0.31	$ 3.19	$ 2.28	$ 2.74
From discontinued operations	$ 0	$ (0.01)	$ (0.01)	$ 0	$ 0.04	$ (0.05)	$ (0.02)	$ (0.02)	$ (0.02)	$ (0.04)	$ (0.06)
Earnings per share	$ 1.02	$ 0.76	$ 0.91	$ 0.48	$ 0.73	$ 0.65	$ 0.56	$ 0.29	$ 3.17	$ 2.24	$ 2.68
Weighted average common shares	5,663	5,661	5,661	5,658	5,656	5,656	5,656	5,649	5,659	5,651	5,640
Diluted earnings (loss) per share:
From continuing operations	$ 1.02	$ 0.77	$ 0.92	$ 0.48	$ 0.68	$ 0.70	$ 0.58	$ 0.31	$ 3.18	$ 2.28	$ 2.74
From discontinued operations	$ (0.01)	$ (0.01)	$ (0.01)	$ 0	$ 0.04	$ (0.05)	$ (0.02)	$ (0.02)	$ (0.02)	$ (0.05)	$ (0.06)
Diluted earnings per share	$ 1.01	$ 0.76	$ 0.91	$ 0.48	$ 0.72	$ 0.65	$ 0.56	$ 0.29	$ 3.16	$ 2.23	$ 2.68
Weighted average common and common equivalent shares	5,692	5,670	5,663	5,678	5,663	5,661	5,660	5,657	5,672	5,656	5,641