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Note 12 - Business Segments, Sales of Products and Significant Customers (Details Textual) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) oz T | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Number of Reportable Segments | 5 |  |
Derivative, Gain on Derivative | $ 8,100 |  |
Derivative, Loss on Derivative |  | $ 6,000 | $ 14,200
Accounts Receivable, Net, Current, Total | 4,184 | 14,805 |
Allowance for Doubtful Accounts Receivable, Ending Balance | 0 |  |
Employee Labor Strike Related Costs | 20,693 | 21,301 |
Lucky Friday [Member] |  |  |
Long-Lived Assets | $ 435,600 |  |
Estimated Mine Life | 17 years |  |
Lucky Friday [Member] | Suspension Costs [Member] |  |  |
Employee Labor Strike Related Costs | $ 14,600 | 17,100 |
Lucky Friday [Member] | Non-cash Depreciation Expense [Member] |  |  |
Employee Labor Strike Related Costs | $ 5,000 | $ 4,200 |
Silver [Member] |  |  |
Metals Contained in Concentrates | oz | 1,000,000 |  |
Gold [Member] |  |  |
Metals Contained in Concentrates | oz | 3,658 |  |
Zinc [Member] |  |  |
Metals Contained in Concentrates | T | 10,689 |  |
Lead [Member] |  |  |
Metals Contained in Concentrates | T | 1,572 |  |

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