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Statements of Income (Unaudited) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Statement [Abstract]    
Revenues $ 5,622,093 $ 5,043,786
Cost of revenues 2,709,399 2,537,506
Gross profit 2,912,694 2,506,280
Operating expenses:    
Research and development 796,608 657,018
Sales and marketing 759,248 686,768
General and administrative 688,804 562,551
Total operating expenses 2,244,660 1,906,337
Operating income 668,034 599,943
Interest expense (29,676) (43,644)
Net income before income taxes 638,358 556,299
Income tax expense (252,551) (7,985)
Net income $ 385,807 $ 548,314
Net income per share:    
Basic $ 0.07 $ 0.10
Diluted $ 0.05 $ 0.09
Weighted average shares outstanding:    
Basic 5,912,088 5,646,397
Diluted 7,771,210 6,504,748