Earnings per share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Reconciliation of the weighted average shares outstanding for the basic and diluted EPS computations [Abstract]
Income from continuing operations	$ 445	$ 1,304	$ 324	$ 1,828
Basic:
Shares outstanding at beginning of period (in shares)	15,401,000	15,119,000	15,210,000	15,051,000
Weighted average shares issued during the period, net (in shares)	4,000	12,000	18,000	54,000
Weighted average common shares, basic (in shares)	15,405,000	15,131,000	15,228,000	15,105,000
Earnings from continuing operations per common share, basic (in dollars per share)	$ 0.03	$ 0.09	$ 0.02	$ 0.12
Diluted:
Weighted average common shares, basic (in shares)	15,405,000	15,131,000	15,228,000	15,105,000
Dilutive impact of stock options and restricted stock awards (in shares)	41,000	76,000	25,000	74,000
Weighted average common shares, diluted (in shares)	15,446,000	15,207,000	15,253,000	15,179,000
Earnings from continuing operations per common share, diluted (in dollars per share)	$ 0.03	$ 0.09	$ 0.02	$ 0.12
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive stock options outstanding (in shares)	418,000	306,000	530,000	659,000