Supplemental disclosure of cash flow and non-cash investing and financing activities (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Supplemental disclosure of cash flow and non-cash investing and financing activities [Abstract]
Cash paid for interest	$ 14	$ 21
Income taxes paid	363	7
Stock issuance of 11,321 shares in exchange for services performed	$ 71	$ 0
Shares issued for services performed (in shares)	11,321	0