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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
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
Restricted stock units (RSUs) [member]    
Statement Line Items [Line Items]    
Risk free rate 1.52% 0.93%
Fair value (USD) | $ $ 12.06 $ 15.88
Share price (USD) (in dollars per share) | $ / shares $ 11.71 $ 15.88
Volatility 1.20% 1.00%
RSU dividends reinvested 1,066 386
Awards paid out/ expired 0 0
Total awards outstanding 18,651 17,971
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
Performance share units (PSUs) [member]    
Statement Line Items [Line Items]    
Risk free rate 1.52% 0.93%
Fair value (USD) | $ $ 11.63 $ 15.51
Share price (USD) (in dollars per share) | $ / shares $ 11.71 $ 15.88
Volatility 1.06% 1.06%
RSU dividends reinvested 0 0
Awards paid out/ expired (30,600) 0
Total awards outstanding 343,379 279,889
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 95,740 95,740
Performance share units (PSUs) [member] | March 23, 2019 [member]    
Statement Line Items [Line Items]    
Grants 28,287 28,287
Performance share units (PSUs) [member] | June 8, 2019 [member]    
Statement Line Items [Line Items]    
Grants 14,672 14,672
Performance share units (PSUs) [member] | January 11, 2020 [member]    
Statement Line Items [Line Items]    
Grants 114,668 114,668
Performance share units (PSUs) [member] | March 31, 2020 [member]    
Statement Line Items [Line Items]    
Grants 1,971 1,971
Performance share units (PSUs) [member] | June 1, 2020 [member]    
Statement Line Items [Line Items]    
Grants 1,740 1,740
Performance share units (PSUs) [member] | September 9, 2020 [member]    
Statement Line Items [Line Items]    
Grants 1,611 1,611
Performance share units (PSUs) [member] | September 14, 2020 [member]    
Statement Line Items [Line Items]    
Grants 20,686 20,686
Performance share units (PSUs) [member] | October 5, 2020 [member]    
Statement Line Items [Line Items]    
Grants 514 514
Performance share units (PSUs) [member] | January 11, 2021 [member]    
Statement Line Items [Line Items]    
Grants 78,875 0
Performance share units (PSUs) [member] | April 1, 2021 [member]    
Statement Line Items [Line Items]    
Grants 770 0
Performance share units (PSUs) [member] | May 14, 2021 [member]    
Statement Line Items [Line Items]    
Grants 2,389 0
Performance share units (PSUs) [member] | June 1, 2021 [member]    
Statement Line Items [Line Items]    
Grants 1,692 0
Performance share units (PSUs) [member] | June 14, 2021 [member]    
Statement Line Items [Line Items]    
Grants 507 0
Performance share units (PSUs) [member] | August 13, 2021 [member]    
Statement Line Items [Line Items]    
Grants 2,283 0
Performance share units (PSUs) [member] | September 1, 2021 [member]    
Statement Line Items [Line Items]    
Grants 553 0
Performance share units (PSUs) [member] | September 6, 2021 [member]    
Statement Line Items [Line Items]    
Grants 531 0
Performance share units (PSUs) [member] | September 20, 2021 [member]    
Statement Line Items [Line Items]    
Grants 526 0
Performance share units (PSUs) [member] | October 1, 2021 [member]    
Statement Line Items [Line Items]    
Grants 2,530 0
Performance share units (PSUs) [member] | October 11, 2021 [member]    
Statement Line Items [Line Items]    
Grants 500 0
Performance share units (PSUs) [member] | November 12, 2021 [member]    
Statement Line Items [Line Items]    
Grants 1,998 0
Performance share units (PSUs) [member] | December 1, 2021 [member]    
Statement Line Items [Line Items]    
Grants 936 0