Unaudited Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2017	$ 396	$ 148,293	$ (35,292)	$ 113,397
Equity-based compensation	5	546		551
Net income			5,266	5,266
Balance at Mar. 31, 2018	401	148,839	(30,026)	119,214
Balance at Dec. 31, 2018	401	150,926	(10,218)	141,109
Equity-based compensation	7	887		894
Net income			6,883	6,883
Balance at Mar. 31, 2019	$ 408	$ 151,813	$ (3,335)	$ 148,886