Earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings per share [Abstract]
Anti-dilutive stock options outstanding (in shares)	1,006,000	1,010,000	1,060,000	972,000
Reconciliation of the weighted average shares outstanding for the basic and diluted EPS computations [Abstract]
Income from continuing operations	$ 1,297	$ 668	$ 2,732	$ 1,112
Basic [Abstract]
Shares outstanding at beginning of period (in shares)	15,585,000	15,590,000	15,592,000	15,473,000
Weighted average shares issued (cancelled) during the period, net (in shares)	4,000	(13,000)	(43,000)	25,000
Weighted average common shares, basic (in shares)	15,589,000	15,577,000	15,549,000	15,498,000
Net income per common share, basic (in dollars per share)	$ 0.08	$ 0.04	$ 0.18	$ 0.07
Diluted [Abstract]
Weighted average common shares, basic (in shares)	15,589,000	15,577,000	15,549,000	15,498,000
Weighted average shares issued (cancelled) during the period, net (in shares)	4,000	0	3,000	1,000
Dilutive impact of stock options and restricted stock awards (in shares)	66,000	58,000	98,000	77,000
Weighted average common shares, diluted (in shares)	15,659,000	15,635,000	15,650,000	15,576,000
Net income per common share, diluted (in dollars per share)	$ 0.08	$ 0.04	$ 0.17	$ 0.07