Condensed Consolidated Statement of Stockholders' Equity - 3 months ended Mar. 31, 2018 - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2017	$ 12	$ 95,963	$ 79,105	$ 175,080
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			4,858	4,858
Balance at Mar. 31, 2018	$ 12	$ 96,846	$ 83,963	$ 180,821
Balance, shares at Mar. 31, 2018	11,691