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Note 6 - Business Segments and Sales of Products - Sales of Products (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Sales of products | $ 199,703 | $ 161,532 | $ 502,983 | $ 448,321
Less: Smelter and refining charges | (18,587) | (5,351) | (52,177) | (21,609)
Sales by significant product type | 209,262 | 160,484 | 515,861 | 448,458
Sales by significant product type | 209,262 | 160,484 | 515,861 | 448,458
Silver Contracts [Member] |  |  |  |
Sales of products | 79,684 | 40,588 | 179,013 | 122,392
Doré and Metals from Doré [Member] |  |  |  |
Sales by significant product type | 67,659 | 87,525 | 211,439 | 231,391
Sales by significant product type | 67,659 | 87,525 | 211,439 | 231,391
Gold [Member] |  |  |  |
Sales of products | 98,457 | 103,889 | 278,363 | 261,734
Carbon [Member] |  |  |  |
Sales by significant product type | 23,835 | 17,745 | 43,099 | 27,376
Sales by significant product type | 23,835 | 17,745 | 43,099 | 27,376
Lead [Member] |  |  |  |
Sales of products | 13,370 | 7,114 | 32,244 | 22,809
Lead Concentrate [Member] |  |  |  |
Sales by significant product type | 85,511 | 37,685 | 192,179 | 122,727
Sales by significant product type | 85,511 | 37,685 | 192,179 | 122,727
Zinc [Member] |  |  |  |
Sales of products | 26,779 | 15,292 | 65,540 | 62,995
Zinc Concentrate [Member] |  |  |  |
Sales by significant product type | 24,322 | 12,345 | 51,727 | 51,876
Sales by significant product type | 24,322 | 12,345 | 51,727 | 51,876
Bulk Concentrate [Member] |  |  |  |
Sales by significant product type | 7,935 | 5,184 | 17,417 | 15,088
Sales by significant product type | $ 7,935 | $ 5,184 | $ 17,417 | $ 15,088

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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 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 2: 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=121604090&loc=SL49130545-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: 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=121604090&loc=SL49130543-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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