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Note 1 - Basis of Preparation of Financial Statements (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
COVID-19 Mitigation Costs | $ 0.1 | $ 1.4 | $ 0.4 | $ 3.0

X
- Definition Information on costs incurred related to mitigating the effect of COVID-19 mitigation. + References No definition available. + Details
Name: | hl_COVID19MitigationCosts
Namespace Prefix: | hl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration