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Net Income (Loss) per Share Applicable to Common Stockholders (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Numerator:            
Net income (loss) $ 119,790 $ 11,839 $ (138,242) $ (225,029) $ 131,629 $ (363,271)
Denominator: Weighted average common shares outstanding used in computing net income (loss) per share:            
Basic 5,999,159   5,880,296   5,969,666 6,309,816
Effect of dilutive stock options 272,348       234,223  
Diluted 6,271,507   5,880,296   6,203,889 6,309,816
Net income (loss) per share applicable to common stockholders:            
Basic $ 0.02   $ (0.02)   $ 0.02 $ (0.06)
Diluted $ 0.02   $ (0.02)   $ 0.02 $ (0.06)