Net Income per Share (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net Income per Share [Abstract]
Weighted average number of common shares outstanding - basic (in shares)	8,223,995	8,025,867	8,150,885	7,981,240
Potential shares exercisable under stock option plans (in shares)	179,000	444,500	262,167	462,667
LESS: Shares which could be repurchased under treasury stock method (in shares)	(86,614)	(190,151)	(125,513)	(201,832)
Weighted average number of common shares outstanding - diluted (in shares)	8,316,381	8,280,216	8,287,539	8,242,075
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	88,200	202,000	137,167	184,167