Acquisitions and Dispositions - Pro Forma Results of Operations for Acquisitions (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Acquisitions and Dispositions
Net operating revenue	$ 31,274	$ 32,772	$ 91,281	$ 95,220
Station operating expense	23,600	24,321	69,642	72,617
Corporate general and administrative	2,788	2,813	8,179	8,205
Other operating expense , net	85	85	86	47
Operating income	4,801	5,553	13,374	14,351
Interest expense	180	243	572	717
Interest income	(162)	(167)	(485)	(444)
Other income	(11)	(25)	(11)	(25)
Income before income tax expense	4,794	5,502	13,298	14,103
Income tax expense	1,460	1,644	3,860	4,233
Net income	$ 3,334	$ 3,858	$ 9,438	$ 9,870
Earnings per share:
Basic	$ 0.56	$ 0.65	$ 1.59	$ 1.66
Diluted	$ 0.56	$ 0.65	$ 1.59	$ 1.66