Condensed Consolidated Statement of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]
Balance at Dec. 31, 2017	$ 176,309	$ 12	$ 95,963	$ 80,334
Balance, shares at Dec. 31, 2017		11,632
Issuance of shares of common stock under restricted stock award agreements, Shares		60
Forfeiture of shares of common stock under restricted stock award agreements, shares		(2)
Stock-based compensation	859		859
Shares issued for exercise of stock options	24		24
Shares issued for exercise of stock options, shares		1
Net income	4,886			4,886
Balance at Mar. 31, 2018	182,078	$ 12	96,846	85,220
Balance, shares at Mar. 31, 2018		11,691
Balance at Dec. 31, 2018	275,533	$ 13	177,683	97,837
Balance, shares at Dec. 31, 2018		13,126
Issuance of shares of common stock under restricted stock award agreements, Shares		52
Stock-based compensation	1,233		1,233
Net income	4,862			4,862
Balance at Mar. 31, 2019	$ 281,628	$ 13	$ 178,916	$ 102,699
Balance, shares at Mar. 31, 2019		13,178