| 9. COMMITMENTS AND CONTINGENCIES (Details Narrative) - USD ($) | 12 Months Ended | |
|---|---|---|
| Apr. 30, 2021 | Apr. 30, 2020 | |
| Commitments and Contingencies Disclosure [Abstract] | ||
| Rent and lease expense | $ 20,429 | $ 30,964 | 
| X | ||||||||||
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- References No definition available. 
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| X | ||||||||||
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- Definition Amount of operating lease expense. Excludes sublease income. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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