Consolidated Income Statements - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues	$ 24,706	$ 34,930	$ 115,766	$ 97,701
Cost of sales	19,636	22,890	80,811	67,649
Gross profit	5,070	12,040	34,955	30,052
Operating expenses:
Selling, general and administrative	3,473	3,895	9,823	8,507
Amortization	121	127	364	365
Total operating expenses	3,594	4,022	10,187	8,872
Operating income	1,476	8,018	24,768	21,180
Interest expense	(24)	(296)	(170)	(919)
Income before income taxes	1,452	7,722	24,598	20,261
Income tax expense (benefit)	(652)	2,933	8,236	7,699
Net income	$ 2,104	$ 4,789	$ 16,362	$ 12,562
Net income per common share - Basic	$ 0.05	$ 0.14	$ 0.39	$ 0.38
Net income per common share - Diluted	$ 0.05	$ 0.14	$ 0.38	$ 0.37
Weighted average number of shares outstanding - Basic	41,869,528	33,873,479	41,648,439	33,265,470
Weighted average number of shares outstanding - Diluted	43,463,982	35,297,585	43,173,427	34,341,930