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Unaudited Condensed Statements of Operations - USD ($)
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Income Statement [Abstract]    
Sales $ 15,107,890 $ 13,305,098
Cost of goods sold 8,322,428 7,110,927
Gross profit 6,785,462 6,194,171
Operating expenses:    
Research and development 2,338,324 2,269,114
Sales and marketing 2,274,065 2,884,386
General and administrative 1,994,671 2,204,340
Total operating expenses 6,607,060 7,357,840
Income (loss) from operations 178,402 (1,163,669)
Other expense (income):    
Interest income (188,005) (110,431)
Interest expense 600 13,904
Total other income (187,405) (96,527)
Income (loss) before income taxes 365,807 (1,067,142)
Provision for income taxes 29,364 38,649
Net income (loss) $ 336,443 $ (1,105,791)
Net income (loss) per share:    
Basic $ 0.03 $ (0.12)
Diluted $ 0.03 $ (0.12)
Weighted average shares used in calculating income (loss) per share:    
Basic 9,625,678 9,479,742
Diluted 9,961,048 9,479,742