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Income Taxes Carryforward (Details) - USD ($) | 12 Months Ended
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Apr. 30, 2020 | Apr. 30, 2019
Tax Credit Carryforward |  |
Increase in valuation allowance | $ 2,871,000 | $ 2,710,000
State |  |
Tax Credit Carryforward |  |
Tax credit carryforwards | 26,694,000 |
IRS |  |
Tax Credit Carryforward |  |
Tax credit carryforwards | $ 2,729,000 |

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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=116821951&loc=d3e32123-109318 + Details
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