Subsequent events (Details) - shares |
6 Months Ended | 12 Months Ended | |
|---|---|---|---|
Jun. 01, 2020 |
May 31, 2020 |
Nov. 30, 2018 |
|
| RSUs [Member] | |||
| Subsequent Event [Line Items] | |||
| Stock options granted in lieu of salary | 200,000 | 225,000 | |
| Subsequent Event [Member] | |||
| Subsequent Event [Line Items] | |||
| Granted (in shares) | 1,600,000 | ||
| Stock options granted in lieu of salary | 170,000 |