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Note 15 - Acquisitions (Details) - Unaudited Pro Forma Financial Information (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Unaudited Pro Forma Financial Information [Abstract]    
Sales of products $ 458,755us-gaap_BusinessAcquisitionsProFormaRevenue $ 544,770us-gaap_BusinessAcquisitionsProFormaRevenue
Net income (loss) (9,539)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss 28,194us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Income (loss) applicable to common stockholders $ (10,091)hl_BusinessAcquisitionProformaIncomeLossApplicableToCommonShareholders $ 27,642hl_BusinessAcquisitionProformaIncomeLossApplicableToCommonShareholders
Basic and diluted income (loss) per common share (in Dollars per share) $ (0.03)us-gaap_EarningsPerShareBasicAndDiluted $ 0.08us-gaap_EarningsPerShareBasicAndDiluted