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Financial Instruments (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financial Instruments      
Unrestricted cash $ 7,313 $ 10,309 $ 3,259
Working capital Surplus 7,713 10,554 428
Accumulated deficit (149,054) (131,841) (156,749)
Gold incurred a loss 17,219 24,905 $ 16,790
Cash payments 298 215  
Recognized in prepaid expenses $ 78 $ 78