Subsequent events (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended						0 Months Ended	1 Months Ended		3 Months Ended	0 Months Ended
	Apr. 30, 2013	Apr. 10, 2013	Mar. 31, 2013	Dec. 31, 2012	Oct. 31, 2012	Apr. 16, 2013 Convertible Preferred Stock [Member]	Apr. 10, 2013 Subsequent Event [Member]	Apr. 22, 2013 Subsequent Event [Member]	Apr. 26, 2013 Subsequent Event [Member]	Mar. 31, 2013 Subsequent Event [Member]	Apr. 10, 2013 Subsequent Event [Member] Restricted Stock [Member]
Business Acquisition, Date of Acquisition Agreement							Apr. 10, 2013
Business Acquisition, Cost of Acquired Entity, Cash Paid							$ 137	$ 203
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares								600,000			50,000
Preferred Stock Shares Outstanding Before Share Issue Under Asset Purchase Agreement						172,517
Cash Maintenance Provision Limit On Shares					345,012
Business Acquisition, Percentage of Voting Interests Acquired								63.00%
Class of Warrant or Right, Exercise Price of Warrants or Rights		3.00	3.85	4.00					3.85
Common Stock Warrant Exchange Ratio Description									5/8ths per share of Common Stock per Warrant exchanged.
Warrants Exercised									678,934	50,000
Maximum Warrants Exchanged For Common Stock									1,357,868
Common Stock Shares Issuable For Warrants									848,671
Proceeds from Warrant Exercises	$ 292								$ 2,614	$ 2,906
Additional Warrants Exercised									36,808