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Other (Income) Expense, Net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Other (Income) Expense, Net      
Unrealized currency exchange (gain) loss $ 493 $ 105 $ (19)
Realized currency exchange loss (gain) (111) (17) 252
Unrealized loss (gain) from gold and silver rounds/bullion, net 55 (1,173) (671)
Loss on disposal of fixed assets 26 3 12
Increase (decrease) in reserve for inventory 175 (148) 885
Unrealized loss on zinc zero cost collar 1,844    
Employee benefit obligation 947    
Other (income) expense (390) 42 5
Total $ 1,020 $ (1,188) $ 464