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Note 10 - Cash-settled Share-based Payments - Inputs for Measurement of Grant Date Fair Values and Share Units Granted (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Jun. 30, 2019
GBP (£)
Statement Line Items [Line Items]      
Fair value (USD) | £     £ 7.44
Restricted stock units (RSUs) [member]      
Statement Line Items [Line Items]      
Fair value (USD) $ 17.32 $ 5.85  
Share price (USD) (in dollars per share) | $ / shares $ 17.32 $ 5.85  
RSU dividends reinvested 869 11,316  
Awards paid out (5,052) (87,434)  
Total awards outstanding 17,845 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 19, 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] | January 19, 2020 [member]      
Statement Line Items [Line Items]      
Grants  
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] | Top of range [member]      
Statement Line Items [Line Items]      
Fair value (USD)   $ 5.79  
Performance multiplier percentage   100.00%  
Performance share units (PSUs) [member]      
Statement Line Items [Line Items]      
Fair value (USD) $ 17.32    
Share price (USD) (in dollars per share) | $ / shares $ 16.98    
RSU dividends reinvested  
Awards paid out (17,774) (306,920)  
Total awards outstanding 263,742 156,473  
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 19, 2019 [member]      
Statement Line Items [Line Items]      
Grants 124,027 124,027  
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 107,640  
Performance share units (PSUs) [member] | January 19, 2020 [member]      
Statement Line Items [Line Items]      
Grants 13,692  
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] | Bottom of range [member]      
Statement Line Items [Line Items]      
Fair value (USD)   $ 5.49  
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%