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Note 14 - Derivative Financial Instruments - Fair Value Losses on Derivative assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement Line Items [Line Items]      
Fair value losses on derivative financial instruments $ 240 $ 266 $ 601
Gold loan agreement [member]      
Statement Line Items [Line Items]      
Fair value losses on derivative financial instruments 114 0 0
Call option [member]      
Statement Line Items [Line Items]      
Fair value losses on derivative financial instruments 21 0 0
Derivative liabilities [member]      
Statement Line Items [Line Items]      
Fair value losses on derivative financial instruments 135 0 0
Gold ETF [member]      
Statement Line Items [Line Items]      
Fair value losses on derivative financial instruments 105 164 0
Gold hedge [member]      
Statement Line Items [Line Items]      
Fair value losses on derivative financial instruments 0 102 601
Derivative assets [member]      
Statement Line Items [Line Items]      
Fair value losses on derivative financial instruments $ 105 $ 266 $ 601