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Net Income (Loss) per Share Applicable to Common Stockholders (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Numerator:                
Net income (loss) $ 94,298 $ 119,790 $ 11,839 $ (45,257) $ (138,242) $ (225,029) $ 225,927 $ (408,528)
Denominator: Weighted average common shares outstanding used in computing net income (loss) per share:                
Basic 5,999,487     5,883,109     5,979,715 6,166,017
Effect of dilutive stock options 317,783         256,958
Diluted 6,317,270     5,883,109     6,236,673 6,166,017
Net income (loss) per share applicable to common stockholders:                
Basic $ 0.02     $ (0.01)     $ 0.04 $ (0.07)
Diluted $ 0.01     $ (0.01)     $ 0.04 $ (0.07)