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Note 8. Shareholders' Equity (Detail) - Potential Per Share Dividend Amounts (USD $) | Jun. 30, 2012
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Quarterly [Member] | Thirty Dollars [Member] |
Dividend payable per share | $ 0.01
Quarterly [Member] | Thirty Five Dollars [Member] |
Dividend payable per share | $ 0.02
Quarterly [Member] | Forty Dollars [Member] |
Dividend payable per share | $ 0.03
Quarterly [Member] | Forty Five Dollars [Member] |
Dividend payable per share | $ 0.04
Quarterly [Member] | Fifty Dollars [Member] |
Dividend payable per share | $ 0.05
Quarterly [Member] | Fifty Five Dollars [Member] |
Dividend payable per share | $ 0.06
Quarterly [Member] | Sixty Dollars [Member] |
Dividend payable per share | $ 0.07
Annual [Member] | Thirty Dollars [Member] |
Dividend payable per share | $ 0.04
Annual [Member] | Thirty Five Dollars [Member] |
Dividend payable per share | $ 0.08
Annual [Member] | Forty Dollars [Member] |
Dividend payable per share | $ 0.12
Annual [Member] | Forty Five Dollars [Member] |
Dividend payable per share | $ 0.16
Annual [Member] | Fifty Dollars [Member] |
Dividend payable per share | $ 0.20
Annual [Member] | Fifty Five Dollars [Member] |
Dividend payable per share | $ 0.24
Annual [Member] | Sixty Dollars [Member] |
Dividend payable per share | $ 0.28

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