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Note 6 - Business Segments and Sales of Products (Details Textual) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) oz T | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Number of Reportable Segments | 4 |  |
Derivative, Gain on Derivative | $ 600 |  |
Derivative, Loss on Derivative |  | $ 4,100 |
Accounts Receivable, Net, Current, Total | 19,713 |  | $ 14,805
Allowance for Doubtful Accounts Receivable, Ending Balance | 0 |  | $ 0
Employee Labor Strike Related Costs | 5,017 | 1,581 |
Lucky Friday [Member] |  |  |
Long-Lived Assets | $ 422,000 |  |
Estimated Mine Life | 22 years |  |
Lucky Friday [Member] | Suspension Costs [Member] |  |  |
Employee Labor Strike Related Costs | $ 4,100 | 1,200 |
Lucky Friday [Member] | Non-cash Depreciation Expense [Member] |  |  |
Employee Labor Strike Related Costs | $ 900 | $ 400 |
Silver [Member] |  |  |
Metals Contained in Concentrates | oz | 1.5 |  |
Gold [Member] |  |  |
Metals Contained in Concentrates | oz | 6,151 |  |
Zinc [Member] |  |  |
Metals Contained in Concentrates | T | 11,030 |  |
Lead [Member] |  |  |
Metals Contained in Concentrates | T | 1,800 |  |

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