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Note 4 - Commitments, Contingencies and Obligations (Details Textual) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 30, 2019 | Oct. 31, 2019 | Jul. 31, 2018 | Dec. 31, 2014 | Aug. 31, 2012 | Jun. 30, 2011 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2014 | Feb. 19, 2020 | Dec. 31, 2019
Environmental Remediation Expense |  | $ 6,100 |  |  |  |  | $ 516 | $ 570 |  |  |
Contractual Obligation, Total |  |  |  |  |  |  | 2,300 |  |  |  |
Finance Lease, Liability, Payment, Due, Total |  |  |  |  |  |  | 11,861 |  |  |  |
Lessee, Operating Lease, Liability, to be Paid, Total |  |  |  |  |  |  | 16,082 |  |  |  |
Performance Obligation Commitments [Member] |  |  |  |  |  |  |  |  |  |  |
Surety Bonds |  |  |  |  |  |  | 181,300 |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  |  |  |  | 28,700 |  |  |  |
Lucky Friday [Member] |  |  |  |  |  |  |  |  |  |  |
Open Purchase Orders |  |  |  |  |  |  | 2,300 |  |  |  |
Casa Berardi [Member] |  |  |  |  |  |  |  |  |  |  |
Open Purchase Orders |  |  |  |  |  |  | 600 |  |  |  |
Greens Creek [Member] |  |  |  |  |  |  |  |  |  |  |
Open Purchase Orders |  |  |  |  |  |  | 3,300 |  |  |  |
Nevada Operations [Member] |  |  |  |  |  |  |  |  |  |  |
Open Purchase Orders |  |  |  |  |  |  | 600 |  |  |  |
Senior Notes [Member] | The 2028 Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 475,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  | 7.25% |
Long-term Debt, Gross |  |  |  |  |  |  | $ 475,000 |  |  |  |
Senior Notes [Member] | The 2021 Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  | 6.875%
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  | $ 506,500
Canadian Assets of Klondex [Member] |  |  |  |  |  |  |  |  |  |  |
Ownership Percentage |  |  | 13.00% |  |  |  |  |  |  |  |
PRP Lawsuit in Mineral County, Colorado [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Value | $ 5,000 |  |  |  |  |  |  |  |  |  |
Lawsuit filed in Ontario (Canada) Superior Court of Justice [Member] | Waterton Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period, Value |  |  | $ 3,700 |  |  |  |  |  |  |  |
Class of Warrant or Right, Warrants Entitled, Value |  |  | 8,900 |  |  |  |  |  |  |  |
Johnny M Mine Area near San Mateo, New Mexico [Member] |  |  |  |  |  |  |  |  |  |  |
Payment Of Response Costs |  |  |  | $ 1,100 | $ 1,100 |  |  |  |  |  |
Estimated Response Costs |  |  | $ 9,600 | 6,100 |  |  |  |  |  |  |
Environmental Remediation Expense |  |  |  |  |  |  |  |  | $ 5,600 |  |
Johnny M Mine Area near San Mateo, New Mexico [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Estimated Alternative Response Costs |  |  |  | 0 |  |  |  |  |  |  |
Johnny M Mine Area near San Mateo, New Mexico [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Estimated Alternative Response Costs |  |  |  | $ 221,000 |  |  |  |  |  |  |
Carpenter Snow Creek Superfund Site, Cascade County, Montana [Member] |  |  |  |  |  |  |  |  |  |  |
Estimated Response Costs |  |  |  |  |  | $ 4,500 |  |  |  |  |
Estimated Future Response Cost |  |  |  |  |  | $ 100,000 |  |  |  |  |

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