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Note 7 - Business Segments and Sales of Products (Details Textual) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) oz T | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) oz T | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Number of Reportable Segments |  |  | 5 |  |
Derivative, Gain on Derivative | $ 5,000 |  | $ 8,300 |  |
Derivative, Loss on Derivative |  | $ 600 |  | $ 3,900 |
Accounts Receivable, Net, Current, Total | 12,947 |  | 12,947 |  | $ 14,805
Allowance for Doubtful Accounts Receivable, Ending Balance | 0 |  | 0 |  | $ 0
Employee Labor Strike Related Costs | 6,519 | $ 4,780 | 18,337 | 14,385 |
Lucky Friday [Member] |  |  |  |  |
Long-Lived Assets | $ 428,800 |  | $ 428,800 |  |
Estimated Mine Life |  |  | 22 years |  |
Lucky Friday [Member] | Suspension Costs [Member] |  |  |  |  |
Employee Labor Strike Related Costs |  |  | $ 13,500 | 11,500 |
Lucky Friday [Member] | Non-cash Depreciation Expense [Member] |  |  |  |  |
Employee Labor Strike Related Costs |  |  | $ 3,700 | $ 2,900 |
Silver [Member] |  |  |  |  |
Metals Contained in Concentrates | oz | 1,200,000 |  | 1,200,000 |  |
Gold [Member] |  |  |  |  |
Metals Contained in Concentrates | oz | 5,734 |  | 5,734 |  |
Zinc [Member] |  |  |  |  |
Metals Contained in Concentrates | T | 7,277 |  | 7,277 |  |
Lead [Member] |  |  |  |  |
Metals Contained in Concentrates | T | 2,447 |  | 2,447 |  |

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