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Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Revenue $ 3,743,782 $ 10,434,153 $ 8,747,215 $ 20,126,597
Cost of revenue 3,249,540 6,277,150 6,719,862 12,209,766
Gross profit 494,242 4,157,003 2,027,353 7,916,831
Operating expenses        
Research and development 72,459 257,872 154,334 469,762
Selling and shipping 286,884 273,903 544,675 587,720
General and administrative 1,744,080 2,108,625 3,470,180 4,135,735
Gain on settlement (628,905)   (628,905)  
Total operating expenses 1,474,518 2,640,400 3,540,284 5,193,217
Operating (loss)/income (980,276) 1,516,603 (1,512,931) 2,723,614
Other income (expense)        
Interest income 6,782 5,732 13,528 11,814
Interest expense (22,462) (24,140) (42,455) (48,865)
Other income 4,448 781
Total other (expense) (15,680) (18,408) (24,479) (36,270)
(Loss)/Income before income taxes (995,956) 1,498,195 (1,537,410) 2,687,344
Income tax (benefit)/expense (500,372) 163,282 (704,062) 684,209
Net (loss)/income $ (495,584) $ 1,334,913 $ (833,348) $ 2,003,135
Basic income/(loss) per common share (in dollars per share) $ (0.08) $ 0.22 $ (0.13) $ 0.32
Diluted income/(loss) per common share (in dollars per share) $ (0.08) $ 0.21 $ (0.13) $ 0.32
Outstanding-basic (in shares) 6,301,983 6,170,075 6,257,563 6,169,201
Stock options (in shares)   130,887   119,146
Outstanding-diluted (in shares) 6,301,983 6,300,961 6,257,563 6,288,347