| Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block] |
The following table summarizes the significant terms of warrants outstanding at February 28, 2022. This table does not include the unit warrants. See Unit Warrants section below.
| |
Range of
exercise
Prices
|
|
|
Number of
warrants
Outstanding
|
|
|
Weighted average
remaining
contractual
life (years)
|
|
|
Weighted average
exercise
price of
outstanding
Warrants
|
|
|
Number of
warrants
Exercisable
|
|
|
Weighted average
exercise
price of
exercisable
Warrants
|
|
| |
$ |
0.41 |
|
|
|
3,514,797 |
|
|
|
0.21 |
|
|
$ |
0.41 |
|
|
|
3,514,797 |
|
|
$ |
0.41 |
|
| |
|
0.50 |
|
|
|
706,500 |
|
|
|
0.04 |
|
|
|
0.50 |
|
|
|
706,500 |
|
|
|
0.50 |
|
| |
|
0.60 |
|
|
|
3,125,000 |
|
|
|
0.72 |
|
|
|
0.60 |
|
|
|
3,125,000 |
|
|
|
0.60 |
|
| |
|
|
|
|
|
7,346,297 |
|
|
|
0.41 |
|
|
$ |
0.50 |
|
|
|
7,346,297 |
|
|
$ |
0.50 |
|
|
The following table summarizes the significant terms of warrants outstanding at May 31, 2021. This table does not include the unit warrants. See Unit Warrants section below.
| |
Range of
exercise
Prices
|
|
|
Number of
warrants
Outstanding
|
|
|
Weighted
average
remaining
contractual
life (years)
|
|
|
Weighted
average
exercise
price of
outstanding
Warrants
|
|
|
Number of
warrants
Exercisable
|
|
|
Weighted
average
exercise
price of
exercisable
Warrants
|
|
| |
$ |
0.49 |
|
|
|
33,465,110 |
|
|
|
1.50 |
|
|
$ |
0.49 |
|
|
|
33,465,110 |
|
|
$ |
0.49 |
|
| |
|
0.50 |
|
|
|
2,736,500 |
|
|
|
1.73 |
|
|
|
0.50 |
|
|
|
2,736,500 |
|
|
|
0.50 |
|
| |
|
0.60 |
|
|
|
17,500,000 |
|
|
|
1.50 |
|
|
|
0.60 |
|
|
|
17,500,000 |
|
|
|
0.60 |
|
| |
|
1.10 |
|
|
|
296,035 |
|
|
|
1.56 |
|
|
|
1.10 |
|
|
|
296,035 |
|
|
|
1.10 |
|
| |
|
|
|
|
|
53,997,645 |
|
|
|
0.51 |
|
|
$ |
0.53 |
|
|
|
53,997,645 |
|
|
$ |
0.53 |
|
|
| Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] |
Transactions involving warrants are summarized as follows. This table does not include the unit warrants. See Unit Warrants section below.
| |
|
Number of
Shares
|
|
|
Weighted Average
Exercise Price
|
|
|
Warrants outstanding at May 31, 2020
|
|
|
54,835,145 |
|
|
$ |
0.53 |
|
|
Granted
|
|
|
- |
|
|
$ |
- |
|
|
Exercised
|
|
|
- |
|
|
$ |
- |
|
|
Cancelled / Expired
|
|
|
(837,500 |
)
|
|
$ |
0.75 |
|
| |
|
|
|
|
|
|
|
|
|
Warrants outstanding at May 31, 2021
|
|
|
53,997,645 |
|
|
$ |
0.53 |
|
|
Granted
|
|
|
3,498,637 |
|
|
$ |
0.41 |
|
|
Exercised
|
|
|
- |
|
|
$ |
- |
|
|
Cancelled / Expired
|
|
|
(50,149,985 |
)
|
|
$ |
0.53 |
|
|
Warrants outstanding at February 28, 2022
|
|
|
7,346,297 |
|
|
$ |
0.50 |
|
|
Transactions involving warrants are summarized as follows. This table does not include the unit warrants. See Unit Warrants section below.
| |
|
Number of
Shares
|
|
|
Weighted
Average
Exercise
Price
|
|
|
Warrants outstanding at May 31, 2019
|
|
|
54,818,985 |
|
|
$ |
0.53 |
|
|
Granted
|
|
|
16,160 |
|
|
$ |
1.10 |
|
|
Exercised
|
|
|
- |
|
|
$ |
- |
|
|
Cancelled / Expired
|
|
|
- |
|
|
$ |
- |
|
| |
|
|
|
|
|
|
|
|
|
Warrants outstanding at May 31, 2020
|
|
|
54,835,145 |
|
|
$ |
0.53 |
|
|
Granted
|
|
|
- |
|
|
$ |
- |
|
|
Exercised
|
|
|
- |
|
|
$ |
- |
|
|
Cancelled / Expired
|
|
|
(837,500 |
)
|
|
$ |
0.75 |
|
|
Warrants outstanding at May 31, 2021
|
|
|
53,997,645 |
|
|
$ |
0.53 |
|
|