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Summary of Significant Accounting Policies (Details 3) - shares
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Net Income Per Common Share    
Weighted average number of shares outstanding 4,847,557 3,833,056
Effect of dilutive stock options 92,736 111,294
Diluted number of shares outstanding 4,940,293 3,944,350
Outstanding stock options not included in the calculation because the effect would be anti-dilutive 184,000 14,000