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v3.20.2

Income Taxes (Details) - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2020 | Apr. 30, 2019
Income Taxes (Details) [Line Items] |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 1,900,000 |
Tax Credit Carryforward, Expiration Year |  | 2023
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 119,000 | $ 64,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 60,000 | $ 54,000
Decrease in Unrecognized Tax Benefits is Reasonably Possible | 1.3 |
Domestic Tax Authority [Member] |  |
Income Taxes (Details) [Line Items] |  |
Operating Loss Carryforwards | 24,600,000 |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 16,400,000 |
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration | 8,200,000 |
Tax Credit Carryforward, Amount | 10,000,000 |
Annual Limitation [Member] | Domestic Tax Authority [Member] |  |
Income Taxes (Details) [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | $ 3,400,000 |

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