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Financial risks (Tables) | 12 Months Ended
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Dec. 31, 2021
Financial Risk Management [Abstract] |
Disclosure of detailed information about foreign currency risk [Table Text Block] |
|  |  |  |  | December 31, |
|  | 2021 |  |  | 2020 |
|  | $ |  |  | $ |
Cash and cash equivalents |  | 23,755 |  |  | 90,638 |
Amounts receivable |  | 2,600 |  |  | 1,709 |
Other assets |  | 1,319 |  |  | 1,327 |
Accounts payable and accrued liabilities |  | (117 | ) |  | (110 | )
Revolving credit facility |  | (50,000 | ) |  | (50,000 | )
Net exposure, in U.S. dollars |  | (22,443 | ) |  | 43,564 |
Equivalent in Canadian dollars |  | (28,453 | ) |  | 55,466 |
Disclosure of detailed information about liquidity risk [Table Text Block] |
|  |  |  |  |  |  |  |  |  |  |  |  | As at December 31, 2021 |
| Total |  |  |  |  |  |  |  |  |  |  |  | Estimated annual payments |
| amount |  |  |  |  |  |  |  |  |  |
| payable | Maturity |  | 2022 |  |  | 2023 |  |  | 2024 |  |  | 2025 |  |  | 2026-2029 |
| $ |  |  | $ |  |  | $ |  |  | $ |  |  | $ |  |  | $ |
Conv. debentures | 312,000 | December 31, 2022 |  | 312,000 |  |  | - |  |  | - |  |  | - |  |  | - |
Revolving credit facility(i) | 128,788 | July 30, 2025 |  | 4,297 |  |  | 4,297 |  |  | 4,297 |  |  | 115,897 |  |  | - |
Equipment financings | 3,969 | October 10, 2025 |  | 1,584 |  |  | 1,664 |  |  | 393 |  |  | 328 |  |  | - |
Lease liabilities | 20,213 | December 31, 2029 |  | 9,388 |  |  | 2,919 |  |  | 1,478 |  |  | 1,291 |  |  | 5,137 |
| 464,970 |  |  | 327,269 |  |  | 8,880 |  |  | 6,168 |  |  | 117,516 |  |  | 5,137 |
(i) The interest payable is based on the actual interest rates and foreign exchange rates as at December 31, 2021.

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