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Common Stock - Narrative (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jun. 15, 2016 | Apr. 30, 2020 | Apr. 30, 2019
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
Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Issuance of registered shares (in shares) | 2,000,000 |  |
Share price (in dollars per share) | $ 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) |  | 0 | 5,462
Issuance of common stock for services |  |  | $ 20,600
Accrued compensation costs |  |  | $ 14,600

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