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Note 12 - Share-based payments - Inputs for Measurement of Grant Date Fair Values and Share Units Granted (Details)
12 Months Ended
Apr. 07, 2023
USD ($)
$ / shares
Jan. 24, 2022
USD ($)
$ / shares
Dec. 31, 2023
USD ($)
$ / shares
Dec. 31, 2022
USD ($)
$ / shares
Restricted stock units (RSUs) [member]        
Statement Line Items [Line Items]        
Risk free rate     0.00% 3.88%
Fair value (USD) | $     $ 0 $ 12.52
Share price (USD) (in dollars per share) | $ / shares     $ 0 $ 12.4
Volatility     0.00% 1.29%
RSU dividends reinvested     1,980 1,980
Settlements/terminations     (19,565) 0
Total awards outstanding     0 19,565
Restricted stock units (RSUs) [member] | January 11, 2019 [member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | March 23, 2019 [member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | June 8, 2019 [member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | January 11, 2020 [member]        
Statement Line Items [Line Items]        
Grants     17,585 17,585
Restricted stock units (RSUs) [member] | March 31, 2020 [member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | June 1, 2020 [member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | September 9, 2020 [member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | September 14, 2020 [member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | October 5, 2020 [member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | January 11, 2021 [member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | April 1, 2021 [member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | May 14, 2021 [member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | June 1, 2021 [member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | June 14, 2021 [member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | August 13, 2021 [member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | September 1, 2021 [member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | September 6, 2021 [member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | September 20, 2021 [member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | October 1, 2021 [member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | October 11, 2021 [member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | November 12, 2021 [member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | December 1, 2021 [member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | January 11, 2022 [member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | January 12, 2022 [member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | May 13, 2022 [member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | June 1, 2022 [member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | July 1, 2022 [member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | October 1, 2022 [member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | April 7, 2023 [Member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | May 15, 2023 [Member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | June 1, 2023 [Member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | June 7, 2023 [Member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | August 10, 2023 [Member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | September 1, 2023 [Member]        
Statement Line Items [Line Items]        
Grants     0 0
Restricted stock units (RSUs) [member] | October 3, 2023 [Member]        
Statement Line Items [Line Items]        
Grants     0 0
Performance share units (PSUs) [member]        
Statement Line Items [Line Items]        
Risk free rate     3.88% 3.88%
Fair value (USD) | $     $ 12.2 $ 12.42
Share price (USD) (in dollars per share) | $ / shares     $ 12.2 $ 12.42
Volatility     0.90% 0.91%
RSU dividends reinvested     0 0
Settlements/terminations     (144,772) (254,491)
Total awards outstanding     182,314 224,408
Performance share units (PSUs) [member] | Bottom of range [member]        
Statement Line Items [Line Items]        
Performance multiplier percentage     93.00% 93.00%
Performance share units (PSUs) [member] | Top of range [member]        
Statement Line Items [Line Items]        
Performance multiplier percentage     100.00% 100.00%
Performance share units (PSUs) [member] | January 11, 2019 [member]        
Statement Line Items [Line Items]        
Grants     0 95,740
Performance share units (PSUs) [member] | March 23, 2019 [member]        
Statement Line Items [Line Items]        
Grants     0 28,287
Performance share units (PSUs) [member] | June 8, 2019 [member]        
Statement Line Items [Line Items]        
Grants     0 14,672
Performance share units (PSUs) [member] | January 11, 2020 [member]        
Statement Line Items [Line Items]        
Grants     69,678 114,668
Performance share units (PSUs) [member] | March 31, 2020 [member]        
Statement Line Items [Line Items]        
Grants     696 1,971
Performance share units (PSUs) [member] | June 1, 2020 [member]        
Statement Line Items [Line Items]        
Grants     0 1,740
Performance share units (PSUs) [member] | September 9, 2020 [member]        
Statement Line Items [Line Items]        
Grants     697 1,611
Performance share units (PSUs) [member] | September 14, 2020 [member]        
Statement Line Items [Line Items]        
Grants     5,300 20,686
Performance share units (PSUs) [member] | October 5, 2020 [member]        
Statement Line Items [Line Items]        
Grants     230 514
Performance share units (PSUs) [member] | January 11, 2021 [member]        
Statement Line Items [Line Items]        
Grants     56,244 78,875
Performance share units (PSUs) [member] | April 1, 2021 [member]        
Statement Line Items [Line Items]        
Grants     0 770
Performance share units (PSUs) [member] | May 14, 2021 [member]        
Statement Line Items [Line Items]        
Grants     964 2,389
Performance share units (PSUs) [member] | June 1, 2021 [member]        
Statement Line Items [Line Items]        
Grants     1,310 1,692
Performance share units (PSUs) [member] | June 14, 2021 [member]        
Statement Line Items [Line Items]        
Grants     398 507
Performance share units (PSUs) [member] | August 13, 2021 [member]        
Statement Line Items [Line Items]        
Grants     0 2,283
Performance share units (PSUs) [member] | September 1, 2021 [member]        
Statement Line Items [Line Items]        
Grants     0 553
Performance share units (PSUs) [member] | September 6, 2021 [member]        
Statement Line Items [Line Items]        
Grants     458 531
Performance share units (PSUs) [member] | September 20, 2021 [member]        
Statement Line Items [Line Items]        
Grants     460 526
Performance share units (PSUs) [member] | October 1, 2021 [member]        
Statement Line Items [Line Items]        
Grants     1,016 2,530
Performance share units (PSUs) [member] | October 11, 2021 [member]        
Statement Line Items [Line Items]        
Grants     450 500
Performance share units (PSUs) [member] | November 12, 2021 [member]        
Statement Line Items [Line Items]        
Grants     1,846 1,998
Performance share units (PSUs) [member] | December 1, 2021 [member]        
Statement Line Items [Line Items]        
Grants     900 936
Performance share units (PSUs) [member] | January 11, 2022 [member]        
Statement Line Items [Line Items]        
Grants     75,198 96,359
Performance share units (PSUs) [member] | January 12, 2022 [member]        
Statement Line Items [Line Items]        
Grants     825 825
Performance share units (PSUs) [member] | May 13, 2022 [member]        
Statement Line Items [Line Items]        
Grants     2,040 2,040
Performance share units (PSUs) [member] | June 1, 2022 [member]        
Statement Line Items [Line Items]        
Grants     1,297 1,297
Performance share units (PSUs) [member] | July 1, 2022 [member]        
Statement Line Items [Line Items]        
Grants     2,375 2,375
Performance share units (PSUs) [member] | October 1, 2022 [member]        
Statement Line Items [Line Items]        
Grants     2,024 2,024
Performance share units (PSUs) [member] | April 7, 2023 [Member]        
Statement Line Items [Line Items]        
Grants     79,521 0
Performance share units (PSUs) [member] | May 15, 2023 [Member]        
Statement Line Items [Line Items]        
Grants     581 0
Performance share units (PSUs) [member] | June 1, 2023 [Member]        
Statement Line Items [Line Items]        
Grants     617 0
Performance share units (PSUs) [member] | June 7, 2023 [Member]        
Statement Line Items [Line Items]        
Grants     572 0
Performance share units (PSUs) [member] | August 10, 2023 [Member]        
Statement Line Items [Line Items]        
Grants     5,514 0
Performance share units (PSUs) [member] | September 1, 2023 [Member]        
Statement Line Items [Line Items]        
Grants     1,617 0
Performance share units (PSUs) [member] | October 3, 2023 [Member]        
Statement Line Items [Line Items]        
Grants     14,258 0
Equity-settled performance units (EPUs) [member]        
Statement Line Items [Line Items]        
Fair value (USD) | $ $ 15.33 $ 10.15    
Share price (USD) (in dollars per share) | $ / shares $ 16.91 $ 11.5    
Performance multiplier percentage 100.00% 100.00% 100.00%  
Total awards outstanding 80,773 113,693