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Note 11 - Business Segments and Significant Customers (Details) - Sales by Geographic Area (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 11 - Business Segments and Significant Customers (Details) - Sales by Geographic Area [Line Items] |  |  |
Sales by geographical area | $ 499,308 hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts | $ 379,546 hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts | $ 322,489 hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts
UNITED STATES |  |  |
Note 11 - Business Segments and Significant Customers (Details) - Sales by Geographic Area [Line Items] |  |  |
Sales by geographical area | 22,200 hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts / us-gaap_StatementGeographicalAxis = country_US | 22,361 hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts / us-gaap_StatementGeographicalAxis = country_US | 25,438 hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts / us-gaap_StatementGeographicalAxis = country_US
CANADA |  |  |
Note 11 - Business Segments and Significant Customers (Details) - Sales by Geographic Area [Line Items] |  |  |
Sales by geographical area | 295,027 hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts / us-gaap_StatementGeographicalAxis = country_CA | 170,632 hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts / us-gaap_StatementGeographicalAxis = country_CA | 34,441 hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts / us-gaap_StatementGeographicalAxis = country_CA
JAPAN |  |  |
Note 11 - Business Segments and Significant Customers (Details) - Sales by Geographic Area [Line Items] |  |  |
Sales by geographical area | 58,466 hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts / us-gaap_StatementGeographicalAxis = country_JP | 50,039 hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts / us-gaap_StatementGeographicalAxis = country_JP | 70,371 hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts / us-gaap_StatementGeographicalAxis = country_JP
KOREA, REPUBLIC OF |  |  |
Note 11 - Business Segments and Significant Customers (Details) - Sales by Geographic Area [Line Items] |  |  |
Sales by geographical area | 70,548 hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts / us-gaap_StatementGeographicalAxis = country_KR | 86,035 hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts / us-gaap_StatementGeographicalAxis = country_KR | 120,106 hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts / us-gaap_StatementGeographicalAxis = country_KR
CHINA |  |  |
Note 11 - Business Segments and Significant Customers (Details) - Sales by Geographic Area [Line Items] |  |  |
Sales by geographical area | $ 53,067 hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts / us-gaap_StatementGeographicalAxis = country_CN | $ 50,479 hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts / us-gaap_StatementGeographicalAxis = country_CN | $ 72,133 hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts / us-gaap_StatementGeographicalAxis = country_CN

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