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Income Taxes - Additional Information (Detail)	12 Months Ended
	Apr. 30, 2017 USD ($)
Income Taxes [Line Items]
State tax credit carry forward	$ 208,000
State tax credit carry forwards, expiration beginning date	2018
Valuation allowance	$ 82,000
Gross net operating losses	1,049,000
Gross net operating losses subject to expiration	$ 569,000
Minimum [Member]
Income Taxes [Line Items]
Gross net operating losses expiration year	2020
Maximum [Member]
Income Taxes [Line Items]
Gross net operating losses expiration year	2022

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32621-109319

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