Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues	$ 105,481	$ 79,722	$ 55,810
Cost of sales	74,395	61,233	49,364
Gross profit	31,086	18,489	6,446
Operating expenses:
Selling and marketing	4,310	4,179	2,723
General and administrative	7,829	6,129	4,708
Total operating expenses	12,139	10,308	7,431
Operating income (loss)	18,947	8,181	(985)
Other income (expense):
Interest expense	(1,118)	(776)	(641)
Other income (expense)	(564)	302	0
Total other (expense)	(1,682)	(474)	(641)
Income (loss) before income taxes	17,265	7,707	(1,626)
Income tax expense (benefit)	6,628	2,944	(906)
Net income (loss)	$ 10,637	$ 4,763	$ (720)
Net income (loss) per common share - Basic	$ 0.31	$ 0.15	$ (0.02)
Net income (loss) per common share - Diluted	$ 0.3	$ 0.14	$ (0.02)
Weighted average number of shares outstanding - Basic	34,104,476	32,546,840	29,122,746
Weighted average number of shares outstanding - Diluted	35,416,910	33,936,099	29,122,746