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Summary of Significant Accounting Policies (Details 2) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Net Income (Loss) Per Common Share        
Weighted average number of shares outstanding 4,178,855 3,034,539 4,005,956 3,030,962
Effect of dilutive stock options 0 121,124 111,032 118,678
Diluted number of shares outstanding 4,178,855 3,155,663 4,116,988 3,149,640
Outstanding stock options not included in the calculation because the effect would be anti-dilutive 270,000 5,000 49,000 7,000