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Note 2 - Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
oz
Dec. 31, 2019
USD ($)
Restricted Cash and Cash Equivalents, Noncurrent, Total   $ 1,053 $ 1,053  
Capitalized Drilling Costs   5,200 4,400 $ 14,400
Foreign Currency Transaction Gain (Loss), Realized   $ 417 $ (4,605) $ (8,236)
Minimum [Member]        
Property, Plant and Equipment, Useful Life (Year)   3 years    
Maximum [Member]        
Property, Plant and Equipment, Useful Life (Year)   14 years    
Casa Berardi [Member]        
Decrease in Expected Gold Production Due to Suspension (Ounce) | oz     11,700  
Suspension Costs     $ 1,600  
Pandemic Related Procedures Costs   $ 2,400    
San Sebastian [Member]        
Suspension Costs     1,800  
Greens Creek [Member]        
Suspension Costs from Quarantining Employee Per Week   $ 1,000 $ 2,300  
Percentage of Increase (Decrease) in Silver Production (30.00%)