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Note 3 - Revision of Previously Issued Financial Statements for Immaterial Misstatements (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Sep. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Depreciation, Depletion and Amortization, Total |  | $ 172,651 | $ 155,006 | $ 196,408
Revision of Prior Period, Adjustment [Member] |  |  |  |
Depreciation, Depletion and Amortization, Total |  |  | $ (9,020) | $ (8,067)
Revision of Prior Period, Adjustment [Member] | Hecla Quebec. Inc [Member] |  |  |  |
Depreciation, Depletion and Amortization, Total | $ 38,200 |  |  |

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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