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Net Income (Loss) per Share Applicable to Common Stockholders (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Numerator:    
Net income (loss) $ 11,839 $ (225,029)
Denominator: Weighted average common shares outstanding used in computing net income (loss) per share:    
Basic 5,939,845 6,744,108
Effect of dilutive stock options 194,004
Diluted 6,133,849 6,744,108
Net income (loss) per share applicable to common stockholders:    
Basic $ 0.00 $ (0.03)
Diluted $ 0.00 $ (0.03)