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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Apr. 30, 2019 | Apr. 30, 2018
Income Taxes [Line Items] |  |
Deferred income tax expense | $ 75,000 |
Tax expense related to GILTI | 265,000 |
State loss carryforward | 26,000 |
State tax credit carry forward | 207,000 |
Valuation allowance, potential expiration of tax credits | 37,000 |
Federal research and development tax credit carryforward | 228,000 |
Foreign tax credit carryforwards | 638,321 | $ 0
Gross net operating losses | 1,126,000 |
Gross net operating losses outside of United States, amount expiring | 501,000 |
Additional valuation allowance | $ 7,000 |
Minimum |  |
Income Taxes [Line Items] |  |
Federal, state and local tax returns period | 3 years |
Foreign subsidiaries tax returns period | 3 years |
Maximum |  |
Income Taxes [Line Items] |  |
Federal, state and local tax returns period | 4 years |
Foreign subsidiaries tax returns period | 7 years |

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