Fair value of financial instruments (Details) - USD ($) |
May 31, 2019 |
Feb. 28, 2019 |
|---|---|---|
| Fair Value Of Financial Instruments Details Abstract | ||
| Warrants (First Issuance), carrying amount | $ 219,531 | |
| Warrants (First Issuance), fair value | 219,531 | |
| Long-term debt, carrying amount | 965,969 | 1,005,518 |
| Long-term debt, fair value | 965,969 | 1,005,518 |
| Convertible notes (First Issuance), carrying amount | 2,495,636 | |
| Convertible notes (First Issuance), fair value | 2,650,000 | |
| Convertible notes (Second Issuance), carrying amount | 3,556,249 | 3,126,886 |
| Convertible notes (Second Issuance), fair value | $ 4,900,000 | $ 3,150,000 |