| STOCK OPTIONS AND WARRANTS (Details - Unvested Option activity) - Unvested Stock Options [Member] | 6 Months Ended | 
|---|---|
| Oct. 31, 2021  $ / shares  shares | |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Options unvested, outstanding | shares | 4,000 | 
| Options outstanding, price per share | $ / shares | $ 10.05 | 
| Options granted | shares | 1,334 | 
| Granted | $ / shares | $ 18.12 | 
| Options vested | shares | (4,334) | 
| Vested | $ / shares | $ 0 | 
| Options forfeited | shares | 0 | 
| Forfeited | $ / shares | $ 0 | 
| Options unvested, outstanding | shares | 1,000 | 
| Options outstanding, price per share | $ / shares | $ 10.05 | 
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- Definition Weighted Average Grant Date Fair Value per Share vested No definition available. 
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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. No definition available. 
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- Definition Net number of share options (or share units) granted during the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Number of non-vested options outstanding. No definition available. 
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- Definition Number of non-vested options forfeited. No definition available. 
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- Definition Weighted average grant-date fair value of non-vested options forfeited. No definition available. 
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- Definition Number of options vested. No definition available. 
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- Details 
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