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Summary of Significant Accounting Policies (Details 3) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Net Income Per Common Share        
Weighted average number of shares outstanding 4,992,803 4,182,529 4,896,782 4,065,243
Effect of dilutive stock options 119,751 102,463 113,938
Diluted number of shares outstanding 4,992,803 4,302,280 4,999,245 4,179,181
Outstanding stock options not included in the calculation because the effect would be anti-dilutive 367,000 20,000 63,000 22,000