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Note 30 - Share-based payments - Inputs for Measurement of Grant Date Fair Values and Share Units Granted (Details)
12 Months Ended
Feb. 27, 2018
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Statement Line Items [Line Items]      
Options Granted 10,000
Risk-free interest rate 2.86%    
Expected stock price volatility (based on historical volatility) 32.00%    
Expected option life in years 3    
Exercise price (in CAD per share) $ 9.30    
Share price at grant date (in CAD per share) $ 9.30    
Fair value at grant date | $ $ 1.40    
Restricted stock units (RSUs) [member]      
Statement Line Items [Line Items]      
Fair value (USD) | $   $ 15.88 $ 8.46
Share price (USD) (in dollars per share)   $ 15.88 $ 8.46
RSU dividends reinvested   995 11,316
Awards paid out/ expired   (5,052) (87,434)
Total awards outstanding   17,971 5,052
Restricted stock units (RSUs) [member] | January 11, 2016 [member]      
Statement Line Items [Line Items]      
Grants   60,645
Restricted stock units (RSUs) [member] | March 23, 2016 [member]      
Statement Line Items [Line Items]      
Grants   10,965
Restricted stock units (RSUs) [member] | June 8, 2016 [member]      
Statement Line Items [Line Items]      
Grants   5,117
Restricted stock units (RSUs) [member] | January 19, 2017 [member]      
Statement Line Items [Line Items]      
Grants   4,443 4,443
Restricted stock units (RSUs) [member] | January 11, 2019 [member]      
Statement Line Items [Line Items]      
Grants  
Restricted stock units (RSUs) [member] | March 23, 2019 [member]      
Statement Line Items [Line Items]      
Grants  
Restricted stock units (RSUs) [member] | June 8, 2019 [member]      
Statement Line Items [Line Items]      
Grants  
Restricted stock units (RSUs) [member] | January 11, 2020 [member]      
Statement Line Items [Line Items]      
Grants   17,585
Restricted stock units (RSUs) [member] | March 31, 2020 [member]      
Statement Line Items [Line Items]      
Grants  
Restricted stock units (RSUs) [member] | June 1, 2020 [member]      
Statement Line Items [Line Items]      
Grants  
Restricted stock units (RSUs) [member] | September 9, 2020 [member]      
Statement Line Items [Line Items]      
Grants  
Restricted stock units (RSUs) [member] | September 14, 2020 [member]      
Statement Line Items [Line Items]      
Grants  
Restricted stock units (RSUs) [member] | October 5, 2020 [member]      
Statement Line Items [Line Items]      
Grants  
Performance share units (PSUs) [member]      
Statement Line Items [Line Items]      
Fair value (USD) | $   $ 15.51 $ 8.19
Share price (USD) (in dollars per share)   $ 15.88 $ 8.46
RSU dividends reinvested  
Awards paid out/ expired   (17,774) (306,920)
Total awards outstanding   279,889 156,473
Performance share units (PSUs) [member] | January 11, 2016 [member]      
Statement Line Items [Line Items]      
Grants   242,579
Performance share units (PSUs) [member] | March 23, 2016 [member]      
Statement Line Items [Line Items]      
Grants   43,871
Performance share units (PSUs) [member] | June 8, 2016 [member]      
Statement Line Items [Line Items]      
Grants   20,470
Performance share units (PSUs) [member] | January 19, 2017 [member]      
Statement Line Items [Line Items]      
Grants   17,774 17,774
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
Performance share units (PSUs) [member] | March 31, 2020 [member]      
Statement Line Items [Line Items]      
Grants   1,971
Performance share units (PSUs) [member] | June 1, 2020 [member]      
Statement Line Items [Line Items]      
Grants   1,740
Performance share units (PSUs) [member] | September 9, 2020 [member]      
Statement Line Items [Line Items]      
Grants   1,611
Performance share units (PSUs) [member] | September 14, 2020 [member]      
Statement Line Items [Line Items]      
Grants   20,686
Performance share units (PSUs) [member] | October 5, 2020 [member]      
Statement Line Items [Line Items]      
Grants   514
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%