Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
Apr. 30, 2015	Apr. 30, 2014
Income Tax Disclosure [Abstract]
State tax credit carry forward	$ 237,000
State tax credit carry forwards, expiration beginning date	2016
Valuation allowance	$ 10,000	$ 50,000

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

Name:	us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant