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Summary of Significant Accounting Policies (Details) - shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net Income (Loss) Per Common Share      
Weighted average number of shares outstanding 3,042,376 3,027,001 3,019,407
Effect of dilutive stock options 123,359 0 65,641
Diluted number of shares outstanding 3,165,735 3,027,001 3,085,048
Outstanding stock options not included in the calculation because the effect would be anti-dilutive 6,000 253,000 63,875