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Summary of Significant Accounting Policies (Details 3) - shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Net Income Per Common Share    
Weighted average number of shares outstanding 4,225,789 3,042,376
Effect of dilutive stock options 110,440 123,359
Diluted number of shares outstanding 4,336,229 3,165,735
Outstanding stock options not included in the calculation because the effect would be anti-dilutive 34,250 6,000