5. STOCK OPTIONS AND WARRANTS (Details - Option Assumptions) |
9 Months Ended | |
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Jan. 31, 2019 |
Jan. 31, 2018 |
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| Employee Options [Member] | ||
| Risk-free interest rate | 2.00% | |
| Expected volatility | 107.00% | |
| Expected lives (years) | 2 years 9 months 18 days | |
| Expected dividend yield | 0.00% | |
| Non-Employee Options [Member] | ||
| Risk-free interest rate | 2.80% | 2.50% |
| Expected volatility | 97.00% | 106.00% |
| Expected lives (years) | 4 years 10 months 25 days | 4 years 3 months 19 days |
| Expected dividend yield | 0.00% | 0.00% |
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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