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Note 5 - Environmental and Reclamation Activities (Details Textual) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Accrual for Environmental Loss Contingencies, Ending Balance | $ 113,231 | $ 116,048 | $ 108,374 | $ 108,389
Greens Creek [Member] |  |  |  |
Asset Retirement Obligation, Liabilities Incurred | 8,600 |  |  |
Casa Berardi [Member] |  |  |  |
Asset Retirement Obligation, Liabilities Incurred | 100 |  |  |
Lucky Friday [Member] |  |  |  |
Asset Retirement Obligation, Liabilities Incurred | 300 |  |  |
Nevada Operations [Member] |  |  |  |
Asset Retirement Obligation, Liabilities Incurred | 300 |  |  |
Asset Retirement Obligation, Revision of Estimate Before Discounting | $ 35,200 | $ 34,200 |  |
Minimum [Member] |  |  |  |
Inflation Rate, Asset Retirement Obligation | 2.00% |  |  |
Minimum [Member] | Reclamation and Abandonment Costs [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |  |
Derivative Liability, Measurement Input | 0.0575 |  |  |
Minimum [Member] | Asset Retirement Obligation [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |  |
Derivative Liability, Measurement Input | 0.0275 |  |  |
Maximum [Member] |  |  |  |
Inflation Rate, Asset Retirement Obligation | 4.00% |  |  |
Maximum [Member] | Reclamation and Abandonment Costs [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |  |
Derivative Liability, Measurement Input | 0.145 |  |  |
Maximum [Member] | Asset Retirement Obligation [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |  |
Derivative Liability, Measurement Input | 0.075 |  |  |

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 + Details
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