Earnings per share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Reconciliation of the weighted average shares outstanding for the basic and diluted EPS computations [Abstract]
Income from continuing operations	$ 248	$ (511)	$ (121)	$ 524
Basic:
Shares outstanding at beginning of period (in shares)	15,161,000	15,088,000	15,151,000	15,051,000
Weighted average shares issued during the period, net (in shares)	10,000	10	11	40
Weighted average common shares, basic (in shares)	15,171,000	15,098,000	15,162,000	15,091,000
Earnings from continuing operations per common share, basic (in dollars per share)	$ 0.02	$ (0.03)	$ (0.01)	$ 0.03
Diluted:
Weighted average common shares, basic (in shares)	15,171,000	15,098,000	15,162,000	15,091,000
Dilutive impact of stock options and restricted stock awards (in shares)	169,000	0	0	72
Weighted average common shares, diluted (in shares)	15,340,000	15,098,000	15,162,000	15,163,000
Earnings from continuing operations per common share, diluted (in dollars per share)	$ 0.02	$ (0.03)	$ (0.01)	$ 0.03
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive stock options outstanding (in shares)	474,000	652,000	579,000	647,000