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Share-Based Payments (Details Textual) (USD $)
3 Months Ended
Jul. 31, 2012
Apr. 30, 2012
Jul. 31, 2011
Stock- based compensation expense $ 739,000   $ 1,014,000
Weighted Average Grant Date Fair Value Granted $ 0.54   $ 0.74
Share Based Compensation Arrangement By Share Based Payment Award Vesting Period Fair Value $ 5,000   $ 43,000
Share Based Compensation Arrangement By Share Based Payment Award Warrants Outstanding 1,416,667   0
Share Based Compensation Arrangement By Share Based Payment Warrants Issued 1,266,667   0
Share Based Compensation Arrangement By Share Based Payment Award Other Than Options Outstanding Weighted Average Exercise Price $ 0 $ 0.91  
Weighted Average Remaining Contractual Term Outstanding, Beginning 3 years 7 months 6 days 3 years 9 months 18 days