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Note 14 - Derivative Financial Instruments - Cash Flows (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Statement Line Items [Line Items]      
Cash flows arising from investing activities $ 478 $ (0) $ (0)
Cash flows arising from financing activities (3,458) 4,026 (1,058)
Gold loan agreement [member]      
Statement Line Items [Line Items]      
Cash flows arising from financing activities (3,698) 2,752 0
Call option [member]      
Statement Line Items [Line Items]      
Cash flows arising from financing activities, proceeds 0 208 0
Call options acquisitions [member]      
Statement Line Items [Line Items]      
Cash flows arising from financing activities, proceeds (176) 0 0
Cap and collar options and call options [member]      
Statement Line Items [Line Items]      
Cash flows arising from financing activities, proceeds 416 0 0
Gold ETF [member]      
Statement Line Items [Line Items]      
Cash flows arising from financing activities 0 $ 1,066 $ (1,058)
Put option [member]      
Statement Line Items [Line Items]      
Cash flows arising from investing activities $ 478