Earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Reconciliation of the weighted average shares outstanding for the basic and diluted EPS computations [Abstract]
Income from continuing operations	$ 100	$ 1,244	$ 115	$ 1,436
Basic [Abstract]
Shares outstanding at beginning of period (in shares)	15,607,000	15,585,000	15,645,000	15,592,000
Weighted average shares issued (cancelled) during the period, net (in shares)	8,000	(1,000)	6,000	(51,000)
Weighted average common shares, basic (in shares)	15,615,000	15,584,000	15,651,000	15,541,000
Income from continuing operations per common share, basic (in dollars per share)	$ 0.01	$ 0.08	$ 0.01	$ 0.09
Diluted [Abstract]
Weighted average common shares, basic (in shares)	15,615,000	15,584,000	15,651,000	15,541,000
Dilutive impact of stock options and restricted stock awards (in shares)	55,000	87,000	66,000	117,000
Weighted average common shares, diluted (in shares)	15,670,000	15,671,000	15,717,000	15,658,000
Income from continuing operations per common share, diluted (in dollars per share)	$ 0.01	$ 0.08	$ 0.01	$ 0.09
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive stock options outstanding (in shares)	38,000	279,000	26,000	208,000