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Financial instruments and risk management - Risk Management and Market risk and credit risk (Details) $ in Thousands |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Oct. 05, 2022 $ / shares shares | Dec. 31, 2022 CAD ($) | Dec. 31, 2021 CAD ($) shares | Dec. 31, 2020 CAD ($) | Dec. 31, 2022 $ / shares | Jun. 01, 2021 | Mar. 20, 2019
Concentration Risk [Line Items] |  |  |  |  |  |  |
Net realized gain (loss) |  | $ 778 | $ 2,737 |  |  |  |
Customer A | Revenues | Major customers |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk, percentage |  | 31.00% | 38.00% |  |  |  |
Customer B | Revenues | Major customers |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk, percentage |  | 24.00% | 27.00% |  |  |  |
Customer C | Revenues | Major customers |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk, percentage |  | 21.00% | 10.00% |  |  |  |
Customer D | Revenues | Major customers |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk, percentage |  | 14.00% | 17.00% |  |  |  |
Customer 1 | Accounts receivable and contract assets | Major customers |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk, percentage |  | 32.00% | 45.00% |  |  |  |
Customer 2 | Accounts receivable and contract assets | Major customers |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk, percentage |  | 16.00% | 6.00% |  |  |  |
Customer 3 | Accounts receivable and contract assets | Major customers |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk, percentage |  | 15.00% | 15.00% |  |  |  |
Customer 4 | Accounts receivable and contract assets | Major customers |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk, percentage |  | 11.00% | 15.00% |  |  |  |
Convertible Subordinated Debt | 5.50% convertible debentures |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Interest rate |  | 5.50% | 5.50% |  |  | 5.50% | 5.50%
Issuance of common shares | shares |  |  | 4,583,655 |  |  |  |
Credit Facility |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Outstanding balance, long-term debt |  | $ 180,000 | $ 110,000 |  |  |  |
Basis on variable rate, adjustment |  | 1.00% |  |  |  |  |
Corresponding change in annual interest expense |  | $ 1,800 |  |  |  |  |
Credit Facility | Credit facility | Revolver |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Unused borrowing availability under the revolving facility |  | 88,000 | 181,100 |  |  |  |
Unused borrowing availability under finance lease obligations |  | 46,600 | 28,600 |  |  |  |
Interest Rate Swap |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Unrealized gain |  | $ 778 |  | $ 4,334 |  |  |
Conversion of stock, shares issued (in shares) | shares | 200,678 |  |  |  |  |  |
Common stock par value (in usd per share) | $ / shares | $ 14.38 |  |  |  |  |  |
Conversion of stock, additional shares issued (in shares) | shares | 152,100 |  |  |  |  |  |
Common stock, par value of additional shares (in usd per share) | $ / shares |  |  |  |  | $ 17.84 |  |
Common stock, fair value per share (in usd per share) | $ / shares |  |  |  |  | $ 18.08 |  |
Net realized gain (loss) |  |  | 2,737 |  |  |  |
Derivative, Gain on Derivative |  |  | $ 7,071 |  |  |  |

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