Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue	$ 6,435,278	$ 10,829,709	$ 15,589,111	$ 20,480,326
Cost of revenue	5,319,060	6,419,255	10,711,979	11,898,737
Gross profit	1,116,218	4,410,454	4,877,132	8,581,589
Operating expenses
Research and development	128,117	110,965	224,923	181,300
Selling and shipping	399,249	352,909	912,724	638,325
General and administrative	1,968,465	2,115,793	4,208,530	4,214,388
Total operating expenses	2,495,831	2,579,667	5,346,177	5,034,013
Operating (loss)/income	(1,379,613)	1,830,787	(469,045)	3,547,576
Other income (expense)
Interest income	29,314	17,478	46,274	26,053
Interest expense	(119,279)	(17,607)	(240,633)	(35,244)
Other (expense)/income				439
Total other (expense)	(89,965)	(129)	(194,359)	(8,752)
(Loss)/income before income taxes	(1,469,578)	1,830,658	(663,404)	3,538,824
Income tax (benefit)/expense	(139,052)	573,783	108,718	1,257,915
Net (loss)/income	$ (1,330,526)	$ 1,256,875	$ (772,122)	$ 2,280,909
Basic (loss)/income per common share (in dollars per share)	$ (0.21)	$ 0.20	$ (0.12)	$ 0.36
Diluted (loss)/income per common share (in dollars per share)	$ (0.21)	$ 0.20	$ (0.12)	$ 0.36
Weighted average common shares Outstanding-basic (in shares)	6,486,067	6,370,244	6,476,712	6,309,308
Stock options (in shares)		34,517		33,205
Weighted average common shares Outstanding-diluted (in shares)	6,486,067	6,404,761	6,476,712	6,342,513