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Note 6 - Business Segments and Sales of Products (Details Textual) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 USD ($) oz T | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($)
Number of Reportable Segments | 5 |  |
Derivative, Gain on Derivative | $ 1,700 |  |
Derivative, Loss on Derivative |  | $ 2,500 |
Accounts Receivable, after Allowance for Credit Loss, Current, Total | $ 6,062 |  | $ 11,952
Accounts Receivable, Allowance for Credit Loss, Ending Balance |  |  | $ 0
Silver Contracts [Member] |  |  |
Metals Contained in Concentrates (Ounce) | oz | 2,100,000 |  |
Gold [Member] |  |  |
Metals Contained in Concentrates (Ounce) | oz | 6,602 |  |
Zinc [Member] |  |  |
Metals Contained in Concentrates (Ounce) | T | 11,376 |  |
Lead [Member] |  |  |
Metals Contained in Concentrates (Ounce) | T | 3,721 |  |

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