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Summary of Significant Accounting Policies (Details 3) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Summary of Significant Accounting Policies [Abstract]        
Weighted average number of shares outstanding 5,481,417 4,848,390 5,479,679 4,847,976
Effect of dilutive stock options 95,327
Diluted number of shares outstanding 5,481,417 4,848,390 5,479,679 4,943,303
Outstanding stock options not included in the calculation because the effect would be anti-dilutive 480,000 368,000 480,000 120,000