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Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Revenue $ 10,434,153 $ 6,107,318 $ 20,126,597 $ 10,492,389
Cost of revenue 6,277,150 3,648,896 12,209,766 6,054,566
Gross profit 4,157,003 2,458,422 7,916,831 4,437,823
Operating expenses        
Research and development 257,872 223,247 469,762 419,176
Selling and shipping 273,903 299,542 587,720 657,867
General and administrative 2,108,625 1,777,693 4,135,735 3,252,755
Total operating expenses 2,640,400 2,300,482 5,193,217 4,329,798
Operating income 1,516,603 157,940 2,723,614 108,025
Other income (expense)        
Interest income 5,732 8,341 11,814 14,675
Interest expense $ (24,140) (27,876) (48,865) (56,891)
Other income   2,382 781 26,211
Total other (expense) $ (18,408) (17,153) (36,270) (16,005)
Income before income taxes 1,498,195 140,787 2,687,344 92,020
Income tax expense/(benefit) 163,282 (61,187) 684,209 158,193
Net income/(loss) $ 1,334,913 $ 201,974 $ 2,003,135 $ (66,173)
Basic income/(loss) per common share (in dollars per share) $ 0.22 $ 0.03 $ 0.32 $ (0.01)
Diluted income/(loss) per common share (in dollars per share) $ 0.21 $ 0.03 $ 0.32 $ (0.01)
Weighted average common shares Outstanding-basic (in shares) 6,170,075 6,112,357 6,169,201 6,114,716
Net effect of potential common share issuance:        
Stock options (in shares) 130,887 112,591 119,146  
Weighted average common shares Outstanding-diluted (in shares) 6,300,961 6,224,948 6,288,347 6,114,716