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Note 9 - Shareholders' Equity (Detail) - Common Stock Dividend Policy (USD $) | 12 Months Ended
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Dec. 31, 2012
$30 [Member] |
Quarterly dividend per share | $ 0.01
Annual dividend per share | $ 0.04
$35 [Member] |
Quarterly dividend per share | $ 0.02
Annual dividend per share | $ 0.08
$40 [Member] |
Quarterly dividend per share | $ 0.03
Annual dividend per share | $ 0.12
$45 [Member] |
Quarterly dividend per share | $ 0.04
Annual dividend per share | $ 0.16
$50 [Member] |
Quarterly dividend per share | $ 0.05
Annual dividend per share | $ 0.20
$55 [Member] |
Quarterly dividend per share | $ 0.06
Annual dividend per share | $ 0.24
$60 [Member] |
Quarterly dividend per share | $ 0.07
Annual dividend per share | $ 0.28

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- Definition No authoritative reference available. + 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 No authoritative reference available. + References No definition available. + Details
Name: | hl_QuarterlyDividendPerShare
Namespace Prefix: | hl_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration