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Note 6 - Business Segments and Sales of Products (Details Textual) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) oz T | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) oz T | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Number of Reportable Segments |  |  | 5 |  |
Derivative, Loss on Derivative | $ 9,600 |  | $ 12,900 | $ 100 |
Derivative, Gain on Derivative |  | $ 1,100 |  |  |
Accounts Receivable, after Allowance for Credit Loss, Current, Total | $ 28,464 |  | $ 28,464 |  | $ 11,952
Accounts Receivable, Allowance for Credit Loss, Ending Balance |  |  |  |  | $ 0
Silver Contracts [Member] |  |  |  |  |
Metals Contained in Concentrates (Ounce) | oz | 1,200,000 |  | 1,200,000 |  |
Gold [Member] |  |  |  |  |
Metals Contained in Concentrates (Ounce) | oz | 3,436 |  | 3,436 |  |
Zinc [Member] |  |  |  |  |
Metals Contained in Concentrates (Ounce) | T | 17,097 |  | 17,097 |  |
Lead [Member] |  |  |  |  |
Metals Contained in Concentrates (Ounce) | T | 3,207 |  | 3,207 |  |

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