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Loss per share (Details Narrative)	12 Months Ended
Loss per share (Details Narrative)	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Loss Per Share Details Narrative
Anti-dilutive exercise of stock options	110,000	452,500	826,500

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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