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Note 6 - Business Segments and Sales of Products - Sales of Products (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Sales of products | $ 152,617 | $ 139,709
Less: Smelter and refining charges | (6,348) | (7,893)
Silver [Member] |  |
Sales of products | 45,506 | 35,222
Gold [Member] |  |
Sales of products | 79,679 | 73,044
Lead [Member] |  |
Sales of products | 9,025 | 9,227
Zinc [Member] |  |
Sales of products | $ 24,755 | $ 30,109

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- Definition The costs of extracting metal from ore. + References No definition available. + Details
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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 + Details
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- Details
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- Details
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