Financial instruments - Contractually obligated cash flow requirements (Details) $ in Thousands |
May 31, 2020
USD ($)
|
|---|---|
| Total | $ 539 |
| Within 1 Year | 539 |
| 1 - 2 Years | 0 |
| 2 - 5 Years | 0 |
| Thereafter | 0 |
| Accounts payable and accrued liabilities [Member] | |
| Total | 539 |
| Within 1 Year | 539 |
| 1 - 2 Years | 0 |
| 2 - 5 Years | 0 |
| Thereafter | $ 0 |