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Provision for Income Taxes (Details 1)	12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012
Federal income tax at statutory rate	34.00%	34.00%
State income tax, net of federal benefit	2.60%	2.30%
Permanent differences	(0.50%)	1.50%
Other	1.60%	(3.00%)
Change in valuation allowance	(39.60%)	(31.90%)
Changes in tax rates	1.70%	(2.90%)
Income tax expense	(0.20%)	0.00%

X

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to permanent differences.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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