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Income Taxes - Additional Information (Detail) | 12 Months Ended
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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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