Note 7 - Income Taxes - Deferred Tax Assets (Details) - USD ($) |
Apr. 30, 2026 |
Apr. 30, 2025 |
|---|---|---|
| Net operating loss carryforwards | $ 13,721,785 | $ 11,774,383 |
| Start-up costs | 631,755 | 942,837 |
| Stock option and warrant payments | 1,019,736 | 746,681 |
| Accumulated depreciation | 1,141,446 | 729,230 |
| Research and development credits | 816,075 | 816,075 |
| Research and development warrants | 21,488 | 21,488 |
| Total deferred tax assets, net | 17,352,285 | 15,030,694 |
| Valuation Allowance | (17,352,285) | (15,030,694) |
| Net Deferred Tax Assets | $ 0 | $ 0 |
| X | ||||||||||
- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences, classified as research and development warrants. No definition available.
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| X | ||||||||||
- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences, classified as start-up costs. No definition available.
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| X | ||||||||||
- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences, classified as stock option and warrant payments. No definition available.
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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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