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Note 6 - Business Segments and Sales of Products (Details Textual) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 USD ($) oz T | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($)
Number of Reportable Segments | 5 |  |
Derivative, Loss on Derivative | $ 2,500 |  |
Derivative, Gain on Derivative |  | $ 600 |
Accounts Receivable, after Allowance for Credit Loss, Current, Total | 9,586 |  | $ 4,184
Accounts Receivable, Allowance for Credit Loss, Ending Balance | 0 |  | $ 0
Employee Labor Strike Related Costs | 2,778 | 5,017 |
Lucky Friday [Member] |  |  |
Long-Lived Assets | $ 435,900 |  |
Estimated Mine Life | 17 years |  |
Lucky Friday [Member] | Suspension Costs [Member] |  |  |
Employee Labor Strike Related Costs | $ 1,900 | 4,100 |
Lucky Friday [Member] | Non-cash Depreciation Expense [Member] |  |  |
Employee Labor Strike Related Costs | $ 900 | $ 900 |
Silver [Member] |  |  |
Metals Contained in Concentrates | oz | 900,000 |  |
Gold [Member] |  |  |
Metals Contained in Concentrates | oz | 4,096 |  |
Zinc [Member] |  |  |
Metals Contained in Concentrates | T | 11,108 |  |
Lead [Member] |  |  |
Metals Contained in Concentrates | T | 1,814 |  |

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