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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
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Dec. 31, 2013 | Dec. 31, 2012
Unaudited Pro Forma Financial Information [Abstract] |  |
Sales of products | $ 458,755 us-gaap_BusinessAcquisitionsProFormaRevenue | $ 544,770 us-gaap_BusinessAcquisitionsProFormaRevenue
Net income (loss) | (9,539)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss | 28,194 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Income (loss) applicable to common stockholders | $ (10,091)hl_BusinessAcquisitionProformaIncomeLossApplicableToCommonShareholders | $ 27,642 hl_BusinessAcquisitionProformaIncomeLossApplicableToCommonShareholders
Basic and diluted income (loss) per common share (in Dollars per share) | $ (0.03)us-gaap_EarningsPerShareBasicAndDiluted | $ 0.08 us-gaap_EarningsPerShareBasicAndDiluted

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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References No definition available. + Details
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