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Note 23 - Derivative Financial Assets - Fair Value Losses on Derivative assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement Line Items [Line Items]      
Fair value losses on derivative assets $ 266 $ 601 $ 360
Gold ETF [member]      
Statement Line Items [Line Items]      
Fair value losses on derivative assets 164
Gold hedge [member]      
Statement Line Items [Line Items]      
Fair value losses on derivative assets $ 102 $ 601 $ 360