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Note 10 - Cash-settled Share-based Payments - Share-based Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Statement Line Items [Line Items]        
Cash-settled share-based payment expense $ 762 $ 9 $ 946 $ 370
Restricted and performance share units [member]        
Statement Line Items [Line Items]        
Cash-settled share-based payment expense     927 344
Cash-settled awards [member]        
Statement Line Items [Line Items]        
Cash-settled share-based payment expense     $ 19 $ 26