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Common Stock - Narrative (Details) - USD ($)		12 Months Ended
	Jun. 15, 2016	Apr. 30, 2019	Apr. 30, 2018
Class of Stock [Line Items]
Proceeds from June 2016 Public Offering	$ 4,300,000
Payments of issuance costs	$ 742,000
Issuance of common stock for services		$ 6,000	$ 37,000
Common Stock
Class of Stock [Line Items]
Issuance of registered shares (in shares)	2,000,000
Share Price	$ 2.25
Over-Allotment Option | Common Stock
Class of Stock [Line Items]
Issuance of registered shares (in shares)	258,749
Consulting Services
Class of Stock [Line Items]
Issuance of common stock (in shares)		5,462	8,569
Issuance of common stock for services		$ 20,600	$ 22,500
Accrued compensation costs			$ 14,600

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