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Note 9 - Share-based payments - Inputs for Measurement of Grant Date Fair Values and Share Units Granted (Details) |  |  |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
May 13, 2024 USD ($) $ / shares | Apr. 08, 2024 USD ($) $ / shares | Apr. 07, 2023 USD ($) $ / shares | Jan. 24, 2022 USD ($) $ / shares | Sep. 30, 2024 USD ($) $ / shares | Dec. 31, 2023 USD ($) $ / shares
Performance share units (PSUs) [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Risk free rate |  |  |  |  | 3.81% | 3.88%
Fair value (USD) | $ |  |  |  |  | $ 14.96 | $ 12.2
Share price (USD) (in dollars per share) |  |  |  |  | $ 14.96 | $ 12.2
Volatility |  |  |  |  | 0.83% | 0.90%
Settlements/ terminations |  |  |  |  | (154,510) | (68,171)
Total awards outstanding |  |  |  |  | 202,516 | 182,314
Performance share units (PSUs) [member] | Bottom of range [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Performance multiplier percentage |  |  |  |  | 95.00% | 93.00%
Performance share units (PSUs) [member] | Top of range [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Performance multiplier percentage |  |  |  |  | 106.00% | 100.00%
Performance share units (PSUs) [member] | January 11, 2021 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Grants |  |  |  |  | 35,341 | 56,244
Performance share units (PSUs) [member] | May 14, 2021 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Grants |  |  |  |  | 482 | 964
Performance share units (PSUs) [member] | June 1, 2021 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Grants |  |  |  |  | 375 | 1,310
Performance share units (PSUs) [member] | June 14, 2021 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Grants |  |  |  |  | 199 | 398
Performance share units (PSUs) [member] | September 6, 2021 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Grants |  |  |  |  | 229 | 458
Performance share units (PSUs) [member] | January 2020 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
exercise price (in dollars per share) |  |  |  |  | $ 0 | $ 13.1
Performance share units (PSUs) [member] | September 20, 2021 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Grants |  |  |  |  | 230 | 460
Performance share units (PSUs) [member] | January 2021 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
exercise price (in dollars per share) |  |  |  |  | $ 11.89 | $ 13.1
Performance share units (PSUs) [member] | October 1, 2021 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Grants |  |  |  |  | 508 | 1,016
Performance share units (PSUs) [member] | January 2022 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
exercise price (in dollars per share) |  |  |  |  | $ 11.89 | $ 13.1
Performance share units (PSUs) [member] | October 11, 2021 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Grants |  |  |  |  | 225 | 450
Performance share units (PSUs) [member] | April 2023 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
exercise price (in dollars per share) |  |  |  |  | $ 10.87 | $ 0
Performance share units (PSUs) [member] | November 12, 2021 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Grants |  |  |  |  | 923 | 1,846
Performance share units (PSUs) [member] | December 1, 2021 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Grants |  |  |  |  | 225 | 900
Performance share units (PSUs) [member] | January 11, 2022 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Grants |  |  |  |  | 41,383 | 75,198
Performance share units (PSUs) [member] | January 12, 2022 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Grants |  |  |  |  | 556 | 825
Performance share units (PSUs) [member] | May 13, 2022 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Grants |  |  |  |  | 1,894 | 2,040
Performance share units (PSUs) [member] | June 1, 2022 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Grants |  |  |  |  | 0 | 1,297
Performance share units (PSUs) [member] | July 1, 2022 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Grants |  |  |  |  | 1,899 | 2,375
Performance share units (PSUs) [member] | October 1, 2022 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Grants |  |  |  |  | 1,800 | 2,024
Performance share units (PSUs) [member] | April 7, 2023 [Member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Grants |  |  |  |  | 73,462 | 79,521
Performance share units (PSUs) [member] | May 15, 2023 [Member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Grants |  |  |  |  | 0 | 581
Performance share units (PSUs) [member] | June 1, 2023 [Member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Grants |  |  |  |  | 617 | 617
Performance share units (PSUs) [member] | June 7, 2023 [Member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Grants |  |  |  |  | 572 | 572
Performance share units (PSUs) [member] | August 10, 2023 [Member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Grants |  |  |  |  | 5,514 | 5,514
Performance share units (PSUs) [member] | September 1, 2023 [Member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Grants |  |  |  |  | 1,617 | 1,617
Performance share units (PSUs) [member] | October 3, 2023 [Member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Grants |  |  |  |  | 14,258 | 14,258
Performance share units (PSUs) [member] | April 8, 2024 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Grants |  |  |  |  | 169,141 | 0
Performance share units (PSUs) [member] | June 10, 2024 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Grants |  |  |  |  | 1,406 | 0
Performance share units (PSUs) [member] | June 17, 2024 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Grants |  |  |  |  | 1,155 | 0
Performance share units (PSUs) [member] | July 1, 2024 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Grants |  |  |  |  | 1,461 | 0
Performance share units (PSUs) [member] | August 12, 2024 [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Grants |  |  |  |  | 1,554 | 0
Equity-settled performance units (EPUs) [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Fair value (USD) | $ | $ 10.02 | $ 9.53 | $ 15.33 | $ 10.15 |  |
Share price (USD) (in dollars per share) | $ 10.01 | $ 10.95 | $ 16.91 | $ 11.5 |  |
Performance multiplier percentage | 100.00% | 100.00% | 100.00% | 100.00% |  |
Total awards outstanding | 14,771 | 125,433 | 80,773 | 113,693 |  |
Equity settlement restricted share units [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Fair value (USD) | $ |  |  |  |  | $ 10.02 |
Share price (USD) (in dollars per share) |  |  |  |  | $ 10.01 |
Performance multiplier percentage |  |  |  |  | 100.00% |
Total awards outstanding |  |  |  |  | 26,404 |
Grant date |  |  |  |  | May 13, 2024 |
Vesting date |  |  |  |  | Sep. 30, 2024 |

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