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Consolidated Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Revenue $ 41,128,639 $ 20,955,347
Cost of revenue 23,528,427 13,850,824
Gross profit 17,600,212 7,104,523
Operating expenses    
Research and development 437,157 433,844
Selling and shipping 1,404,938 1,097,661
General and administrative 8,539,244 6,926,487
Gain on settlement   (628,905)
Total operating expenses 10,381,339 7,829,087
Operating income/(loss) 7,218,873 (724,564)
Other income (expense):    
Interest income 80,518 28,233
Interest expense (106,280) (79,861)
Other income/(expense) 2,244 123,006
Total other (expense)/income net (23,518) 71,378
Income/(loss) before income tax expense/(benefit) 7,195,355 (653,186)
Income tax expense/(benefit) 1,933,944 (504,061)
Net income/(loss) $ 5,261,411 $ (149,124)
Basic income/(loss) per common share (in dollars per share) $ 0.83 $ (0.02)
Diluted income/(loss) per common share (in dollars per share) $ 0.82 $ (0.02)
Weighted average common shares Outstanding-basic (in shares) 6,375,848 6,285,815
Weighted average common shares Outstanding-diluted (in shares) 6,387,464 6,285,815