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Note 8 - Stockholders' Equity - Common Stock Dividend Policy (Details) | 3 Months Ended
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Mar. 31, 2020 $ / shares
Quarterly Average Realized Price, Level 1 [Member] |
Quarterly dividend per share (in dollars per share) | $ 0.01
Annual dividend per share (in dollars per share) | 0.04
Quarterly Average Realized Price, Level 2 [Member] |
Quarterly dividend per share (in dollars per share) | 0.02
Annual dividend per share (in dollars per share) | 0.08
Quarterly Average Realized Price, Level 3 [Member] |
Quarterly dividend per share (in dollars per share) | 0.03
Annual dividend per share (in dollars per share) | 0.12
Quarterly Average Realized Price, Level 4 [Member] |
Quarterly dividend per share (in dollars per share) | 0.04
Annual dividend per share (in dollars per share) | 0.16
Quarterly Average Realized Price, Level 5 [Member] |
Quarterly dividend per share (in dollars per share) | 0.05
Annual dividend per share (in dollars per share) | $ 0.20

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- Definition Represents the annual dividend per share. + References No definition available. + Details
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Namespace Prefix: | hl_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the quarterly dividend per share. + References No definition available. + Details
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Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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