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Common Stock - Narrative (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jun. 15, 2016 | Apr. 30, 2018 | Apr. 30, 2017
Class of Stock [Line Items] |  |  |
Proceeds from June 2016 Public Offering | $ 4,300,000 | $ 0 | $ 4,340,000
Payments of issuance costs | $ 742,000 |  |
Issuance of common stock for services |  | $ 37,000 | $ 44,000
Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Issuance of registered shares (in shares) | 2,000,000 |  |
Share Price | $ 2.25 |  |
Issuance of common stock (in shares) |  | 8,569 | 18,564
Issuance of common stock for services |  | $ 22,500 | $ 43,040
Over-Allotment Option | Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Issuance of registered shares (in shares) | 258,749 |  |

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