Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash paid during the period for:
Interest	$ 145	$ 253	$ 311
Income taxes	4,160	3,450	1,099
Non-cash transactions:
Barter revenue	2,431	2,125	2,014
Barter expense	2,477	2,124	1,881
Acquisition of property and equipment	2		6
Use of treasury shares for 401(k) match	$ 249	$ 221	$ 250