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Note 6 - Business Segments and Sales of Products (Details Textual) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) oz | Sep. 30, 2019 USD ($) oz | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) oz | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Number of Reportable Segments |  |  |  | 5 |  |
Derivative, Gain on Derivative |  | $ 1,100 |  | $ 5,000 | $ 8,300 |
Derivative, Loss on Derivative |  |  | $ 100 |  |  |
Accounts Receivable, after Allowance for Credit Loss, Current, Total | $ 6,222 | 6,222 |  | 6,222 |  | $ 4,184
Accounts Receivable, Allowance for Credit Loss, Ending Balance |  |  |  |  |  | 0
Contract with Customer, Liability, Current | 20,084 | 20,084 |  | 20,084 |  | $ 0
Cost of Goods and Services Sold, Total |  | 146,652 | 137,073 | 450,240 | 350,253 |
Depreciation, Depletion and Amortization, Total |  |  |  | 143,040 | 108,814 |
Employee Labor Strike Related Costs |  | 3,722 | $ 6,519 | 8,766 | 18,337 |
Greens Creek [Member] |  |  |  |  |  |
Proceeds from Customers | 20,100 |  |  |  |  |
Contract with Customer, Liability, Current | 20,100 | 20,100 |  | 20,100 |  |
Cost of Goods and Services Sold, Total | 9,200 |  |  |  |  |
Depreciation, Depletion and Amortization, Total | 2,600 |  |  |  |  |
Lucky Friday [Member] |  |  |  |  |  |
Long-Lived Assets | $ 437,000 | $ 437,000 |  | $ 437,000 |  |
Estimated Mine Life |  |  |  | 17 years |  |
Lucky Friday [Member] | Suspension Costs [Member] |  |  |  |  |  |
Employee Labor Strike Related Costs |  |  |  | $ 5,700 | 13,500 |
Lucky Friday [Member] | Non-cash Depreciation Expense [Member] |  |  |  |  |  |
Employee Labor Strike Related Costs |  |  |  | $ 3,100 | $ 3,700 |
Silver Contracts [Member] |  |  |  |  |  |
Metals Contained in Concentrates | oz | 2,900,000 | 2,900,000 |  | 2,900,000 |  |
Gold [Member] |  |  |  |  |  |
Metals Contained in Concentrates | oz | 8,831 | 8,831 |  | 8,831 |  |
Zinc [Member] |  |  |  |  |  |
Metals Contained in Concentrates | oz | 10,737 | 10,737 |  | 10,737 |  |
Lead [Member] |  |  |  |  |  |
Metals Contained in Concentrates | oz | 6,344 | 6,344 |  | 6,344 |  |

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