| 6. STOCK OPTIONS AND WARRANTS (Details - Unvested stock options) - Unvested Stock Options [Member] | 9 Months Ended | 
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| Jan. 31, 2016  $ / shares  shares | |
| Options Outstanding | |
| Non-vested, Beginning balance | shares | 6,600,000 | 
| Granted | shares | 15,600,000 | 
| Vested | shares | 6,700,000 | 
| Non-vested, Ending balance | shares | 15,500,000 | 
| Weighted Average Grant Date Fair Value Per Share | |
| Non-vested, Beginning balance | $ / shares | $ 0.10 | 
| Granted | $ / shares | .06 | 
| Vested | $ / shares | .08 | 
| Non-vested, Ending balance | $ / shares | $ 0.08 | 
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- Definition Share-based Compensation Arrangements by Share-based Payment Award, Options, Vested in Period, Weighted Average Exercise Price No definition available. 
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- Definition Net number of share options (or share units) granted during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available. 
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- References No definition available. 
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. No definition available. 
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- Definition Number of non-vested options outstanding. No definition available. 
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- Definition Weighted average grant-date fair value of non-vested options outstanding. No definition available. 
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- Definition Number of options vested. No definition available. 
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- Details 
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