CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Class A Common Stock	Class B Common Stock	Additional paid-in Capital	Retained Earnings
Balance at Dec. 31, 2017	$ 136,585	$ 24	$ 100	$ 55,612	$ 80,849
Net income	15,325				15,325
Share conversion		100	$ (100)
Cash dividends	(2,487)				(2,487)
Issuance of common stock	139			139
Balance at Dec. 31, 2018	149,562	124		55,751	93,687
Net income	15,998				15,998
Cash dividends	(3,483)				(3,483)
Issuance of common stock	118			118
Balance at Dec. 31, 2019	162,195	124		55,869	106,202
Net income	10,323				10,323
Cash dividends	(4,980)				(4,980)
Issuance of common stock	118			118
Balance at Dec. 31, 2020	$ 167,656	$ 124		$ 55,987	$ 111,545