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Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenue $ 4,027,768 $ 10,831,729 $ 19,616,879 $ 31,312,055
Cost of revenue 4,083,752 6,229,062 14,795,731 18,127,799
Gross (loss)/profit (55,984) 4,602,667 4,821,148 13,184,256
Operating expenses        
Research and development 240,613 158,310 465,536 339,610
Selling and shipping 331,280 345,406 1,244,004 983,731
General and administrative 2,225,593 2,208,628 6,434,123 6,423,016
Total operating expenses 2,797,486 2,712,344 8,143,663 7,746,357
Operating (loss)/income (2,853,470) 1,890,323 [1] (3,322,515) 5,437,899
Other income (expense)        
Interest income 40,720 28,485 86,994 54,538
Interest expense (114,692) (17,189) (355,325) (52,433)
Other (expense)/income 2,575 3,014
Total other (expense), net (73,972) 13,871 (268,331) 5,119
(Loss)/income before income taxes (2,927,442) 1,904,194 (3,590,846) 5,443,018
Income tax (benefit)/expense (424,640) 508,316 (315,922) 1,766,231
Net (loss)/income $ (2,502,802) $ 1,395,878 $ (3,274,924) $ 3,676,787
Basic (loss)/income per common share (in dollars per share) $ (0.39) $ 0.22 $ (0.51) $ 0.58
Diluted (loss)/income per common share (in dollars per share) $ (0.39) $ 0.22 $ (0.51) $ 0.58
Weighted average common shares Outstanding-basic (in shares) 6,494,986 6,378,656 6,482,870 6,314,224
Stock options (in shares) 34,410 33,748
Weighted average common shares Outstanding-diluted (in shares) 6,494,986 6,413,066 6,482,870 6,347,972
[1] All elimination entries represent intersegment transactions eliminated in consolidation for external financial reporting.