Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
Apr. 30, 2016	Apr. 30, 2015
Income Tax Disclosure [Abstract]
State tax credit carry forward	$ 224,000
State tax credit carry forwards, expiration beginning date	2017
Valuation allowance		$ 10,000

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