Summary of Significant Accounting Policies (Details 3) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net Income Per Common Share
Weighted average number of shares outstanding	4,848,390	4,178,855	4,847,976	4,005,956
Effect of dilutive stock options			95,327	111,032
Diluted number of shares outstanding	4,848,390	4,178,855	4,943,303	4,116,988
Outstanding stock options not included in the calculation because the effect would be anti-dilutive	368,000	270,000	120,000	31,500