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Statements of Income - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]    
Revenues $ 20,787,588 $ 18,400,182
Cost of revenues 10,353,370 9,465,443
Gross profit 10,434,218 8,934,739
Operating expenses:    
Research and development 2,889,168 2,323,005
Sales and marketing 2,774,809 2,497,093
General and administrative 2,207,225 1,985,804
Total operating expenses 7,871,202 6,805,902
Operating income 2,563,016 2,128,837
Interest expense and other, net (131,349) (279,225)
Net income before income taxes 2,431,667 1,849,612
Net income tax benefit (expense) 9,715,421 (31,940)
Net income $ 12,147,088 $ 1,817,672
Net income per share:    
Basic $ 2.10 $ 0.33
Diluted $ 1.80 $ 0.31
Weighted average shares outstanding:    
Basic 5,793,245 5,554,541
Diluted 6,819,821 5,906,236