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Summary of significant accounting policies (Details Textual)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Class of Stock [Line Items]
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)	15,748	1,166,667	15,748	1,166,667
Warrants Antidilutive	1,534,321		1,534,321
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	176,667	346,000	176,667	346,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		6		6

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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