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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
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 $ 499,308hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts $ 379,546hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts $ 322,489hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts
UNITED STATES      
Note 11 - Business Segments and Significant Customers (Details) - Sales by Geographic Area [Line Items]      
Sales by geographical area 22,200hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts
/ us-gaap_StatementGeographicalAxis
= country_US		 22,361hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts
/ us-gaap_StatementGeographicalAxis
= country_US		 25,438hl_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 295,027hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts
/ us-gaap_StatementGeographicalAxis
= country_CA		 170,632hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts
/ us-gaap_StatementGeographicalAxis
= country_CA		 34,441hl_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 58,466hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts
/ us-gaap_StatementGeographicalAxis
= country_JP		 50,039hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts
/ us-gaap_StatementGeographicalAxis
= country_JP		 70,371hl_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 70,548hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts
/ us-gaap_StatementGeographicalAxis
= country_KR		 86,035hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts
/ us-gaap_StatementGeographicalAxis
= country_KR		 120,106hl_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 $ 53,067hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts
/ us-gaap_StatementGeographicalAxis
= country_CN		 $ 50,479hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts
/ us-gaap_StatementGeographicalAxis
= country_CN		 $ 72,133hl_SalesRevenueGoodsExcludingGainLossOnForwardContracts
/ us-gaap_StatementGeographicalAxis
= country_CN