Income Taxes - Narrative (Details) - USD ($) |
Apr. 30, 2021 |
Apr. 30, 2020 |
Apr. 30, 2019 |
|---|---|---|---|
| Income Tax Disclosure [Abstract] | 听 | 听 | 听 |
| Valuation allowance | $ 14,776,048 | $ 12,399,948 | $ 10,051,034 |
| Net operating loss carry forwards | 61,100,000 | 听 | 听 |
| Operating loss carryforwards subject to expiration | $ 28,200,000 | 听 | 听 |
| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are subject to expiration dates. No definition available.
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| X | ||||||||||
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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