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Options (Details Narrative) (10-K) - USD ($) | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 31, 2019 | Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Stock option granted | 505,000 | 505,000 | 560,400 | 253,846 | 505,000 |  | 560,400 | 263,846
Stock option exercise price, upper range limit |  |  | $ 0.50 | $ 0.65 |  |  |  |
Stock option term |  |  | 10 years | 10 years |  |  |  |
Stock option vested, description |  |  | The options vest over a period of four to five years. | The options vest over a period of one and four years. |  |  |  |
Option expense |  |  |  |  | $ 99,990 | $ 88,072 | $ 169,828 | $ 267,835
Unrecognized compensation costs |  |  |  |  |  |  | $ 192,007 |
Weighted average period term |  |  |  |  |  |  | 6 years 11 months 23 days |
Four Option Granted [Member] |  |  |  |  |  |  |  |
Stock option granted |  |  |  | 650,000 |  |  |  |
Stock option term |  |  |  | 10 years |  |  |  |
Option expense |  |  |  | $ 69,611 |  |  |  |
Black-Scholes Option Price Model [Member] |  |  |  |  |  |  |  |
Fair value of options granted |  |  |  |  |  |  | $ 278,358 | $ 169,100
Minimum [Member] |  |  |  |  |  |  |  |
Stock option vested period | 4 years | 4 years |  |  |  |  |  |
Weighted average period term |  |  |  |  | 5 years |  | 4 years | 4 years 8 months 26 days
Maximum [Member] |  |  |  |  |  |  |  |
Stock option vested period | 5 years | 5 years |  |  |  |  |  |
Weighted average period term |  |  |  |  | 7 years |  | 5 years | 7 years 6 months
Employee [Member] |  |  |  |  |  |  |  |
Stock option granted |  |  |  |  |  |  | 560,400 | 263,846
Stock option exercise price, lower range limit |  |  |  |  |  |  | $ 0.41 | $ 0.41
Stock option exercise price, upper range limit |  |  |  |  |  |  | $ 1.02 | $ 1.02
Stock option term |  |  |  |  |  |  | 10 years | 10 years
Options expire date |  |  |  |  |  |  | Apr. 30, 2028 | Apr. 30, 2028
Employee [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Stock option vested period |  |  |  |  |  |  | 4 years | 4 years
Employee [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Stock option vested period |  |  |  |  |  |  | 5 years | 5 years
Stock Option Plan [Member] |  |  |  |  |  |  |  |
Stock option, description |  |  |  |  | All options may be exercised for a period up to four 1/2 years following the grant date, after which they expire. |  | All options may be exercised for a period up to four 1/2 years following the grant date, after which they expire. |
Stock option vested period |  |  |  |  | 5 years |  | 5 years |
Stock option granted |  |  |  |  | 2,000,000 |  | 2,000,000 |

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