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Note 1 - Basis of Preparation of Financial Statements (Details Textual)
$ in Millions
 9 Months Ended
Sep. 30, 2020
USD ($)
Casa Berardi [Member]  
Suspension Costs $ 1.6
San Sebastian [Member]  
Suspension Costs 1.1
Greens Creek [Member]  
Suspension Costs from Quarantining Employee Per Week $ 1.9