Earnings per share (Tables)

6 Months Ended

Jun. 30, 2015

Earnings Per Share [Abstract]

Schedule of Reconciliation of Weighted Average Shares Used in Calculation of Basic and Diluted Earnings Per Share

The following is a reconciliation of the weighted average shares used in the basic and diluted net loss per common share computations.

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Weighted average common shares-basic		18,769,415		18,445,348		18,750,804		18,322,185
Effect of dilutive securities:
Unexercised stock options net of treasury share    repurchase		220,164		175,844		—		112,943
Weighted average common shares-diluted		18,989,579		18,621,192		18,750,804		18,435,128