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Interest and Finance Costs Net (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of other provisions [line items]    
Interest income $ 1,217 $ 1,838
Interest expense (1,510) (857)
Bank stand-by and commitment fees (369) (415)
Accretion expense (751) (590)
Interest and finance (costs) income, net (1,413) (24)
Capitalized interest costs incurred 9,431 6,005
Lindero Project [member]    
Disclosure of other provisions [line items]    
Capitalized interest costs incurred $ 9,431 $ 5,259