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Note 14 - Derivative Financial Instruments - Fair Value Losses on Derivative assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Gold hedge [member]      
Statement Line Items [Line Items]      
Fair value losses on derivative financial instruments $ 0 $ 0 $ 102
Derivative assets [member]      
Statement Line Items [Line Items]      
Fair value losses on derivative financial instruments 1,198 240 266
Put option [member]      
Statement Line Items [Line Items]      
Fair value losses on derivative financial instruments 38 0 0
Gold loan agreement [member]      
Statement Line Items [Line Items]      
Fair value losses on derivative financial instruments (228) 21 0
Call option [member]      
Statement Line Items [Line Items]      
Fair value losses on derivative financial instruments (240) 0 0
Cap and collar options and call options [member]      
Statement Line Items [Line Items]      
Fair value losses on derivative financial instruments 832 114 0
Call options transaction costs [member]      
Statement Line Items [Line Items]      
Fair value losses on derivative financial instruments 796 0 0
Gold ETF [member]      
Statement Line Items [Line Items]      
Fair value losses on derivative financial instruments $ 0 $ 105 $ 164