Earnings per share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Reconciliation of the weighted average shares outstanding for the basic and diluted EPS computations [Abstract]
Income from continuing operations	$ (369)	$ 1,035
Basic:
Shares outstanding at beginning of period (in shares)			15,154,000	15,051,000
Weighted average shares issued during the period, net (in shares)	0	32,000
Weighted average common shares, basic (in shares)	15,154,000	15,083,000
Earnings from continuing operations per common share, basic (in dollars per share)	$ (0.02)	$ 0.07
Diluted:
Weighted average common shares, basic (in shares)	15,154,000	15,083,000
Dilutive impact of stock options and restricted stock awards (in shares)	0	79,000
Weighted average common shares, diluted (in shares)	15,154,000	15,162,000
Earnings from continuing operations per common share, diluted (in dollars per share)	$ (0.02)	$ 0.07
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive stock options outstanding (in shares)	0	643,000