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Summary of Significant Accounting Policies (Details 3) - shares
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Summary of Significant Accounting Policies [Abstract]    
Weighted average number of shares outstanding 5,477,921 4,847,557
Effect of dilutive stock options 92,736
Diluted number of shares outstanding 5,477,921 4,940,293
Outstanding stock options not included in the calculation because the effect would be anti-dilutive 477,000 184,000