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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
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Apr. 30, 2021 | Apr. 30, 2020
Income Tax Contingency [Line Items] |  |
Additional valuation allowance deferred income tax assets | $ 79,000 |
Effective income tax rate, provisions (benefit) | 23.40% | 29.40%
Gross tax-effected unrecognized tax benefits | $ 0 | $ 0
Federal |  |
Income Tax Contingency [Line Items] |  |
Net operating loss carryforwards | 0 |
State |  |
Income Tax Contingency [Line Items] |  |
Net operating loss carryforwards | 17,700,000 | 17,700,000
Tax credit carryforwards | 2,900,000 | 2,900,000
Valuation allowances for net operating loss carryforward | 904,000 | 904,000
Valuation allowances for tax credits | $ 2,300,000 | $ 2,300,000
State | Minimum |  |
Income Tax Contingency [Line Items] |  |
Operating loss carry forwards expiration dates | Apr. 30, 2027 |
State tax credit carryforwards expire date | Apr. 30, 2023 |
State | Maximum |  |
Income Tax Contingency [Line Items] |  |
Operating loss carry forwards expiration dates | Apr. 30, 2040 |
State tax credit carryforwards expire date | Apr. 30, 2025 |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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