XML 62 R48.htm IDEA: XBRL DOCUMENT
v3.22.1

Note 12 - Subsequent Events (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Apr. 30, 2022 | Mar. 31, 2022 | Mar. 31, 2021
Payments to Acquire Equity Securities, FV-NI |  | $ 10,868 | $ (0)
Equity Securities in Mining Companies [Member] |  |  |
Payments to Acquire Equity Securities, FV-NI |  | $ 10,900 | $ 0
Subsequent Event [Member] | Equity Securities in Mining Companies [Member] |  |  |
Payments to Acquire Equity Securities, FV-NI | $ 10,000 |  |

X
- Definition Amount of cash outflow to acquire investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as investing activity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=123583714&loc=SL75117360-209713 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 19 -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3444-108585 + Details
Name: | us-gaap_PaymentsToAcquireEquitySecuritiesFvNi
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_InvestmentTypeAxis=hl_EquitySecuritiesInMiningCompaniesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |