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Income Taxes - Additional Information (Detail) (USD $)	Apr. 30, 2013	Apr. 30, 2012
Income Tax Disclosure [Abstract]
Federal tax credit carry forwards	$ 50,000
Federal tax credit carry forwards, expiration beginning date	2020
State tax credit carry forward	286,000
State tax credit carry forwards, expiration beginning date	2014
Valuation allowance	$ 59,000	$ 73,000

The amount of the valuation allowance recorded as of the balance sheet date pertaining to the specified deferred tax asset for which an assessment was made that it is more likely than not that all or a portion of such deferred tax asset will not be realized through related deductions on future tax returns.

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