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Note 7 - Business Segments and Sales of Products - Information About Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Net sales | $ 143,649 | $ 140,839 |  |  |  | $ 430,617 | $ 417,662 |  |
Income (loss) from operations | (30,376) | 20,268 | $ 2,511 | $ 14,388 | $ 16,899 | (14,671) | 37,167 | $ 60,106 | $ 109,439
Greens Creek [Member] |  |  |  |  |  |  |  |  |
Net sales | 65,187 | 61,062 |  |  |  | 205,642 | 191,250 |  |
Income (loss) from operations | 10,705 | 16,575 |  |  |  | 59,373 | 46,107 |  |
Lucky Friday [Member] |  |  |  |  |  |  |  |  |
Net sales | (11) | 199 |  |  |  | 8,253 | 20,022 |  |
Income (loss) from operations | (5,404) | (4,642) |  |  |  | (14,811) | (8,974) |  |
Casa Berardi [Member] |  |  |  |  |  |  |  |  |
Net sales | 52,850 | 53,989 |  |  |  | 164,501 | 139,524 |  |
Income (loss) from operations | (1,146) | 2,208 |  |  |  | 3,118 | (4,692) |  |
San Sebastian [Member] |  |  |  |  |  |  |  |  |
Net sales | 14,129 | 25,589 |  |  |  | 40,727 | 66,866 |  |
Income (loss) from operations | (2,381) | 17,017 |  |  |  | 2,275 | 42,363 |  |
Nevada Operations [Member] |  |  |  |  |  |  |  |  |
Net sales | 11,494 |  |  |  |  | 11,494 |  |  |
Income (loss) from operations | (13,741) |  |  |  |  | (13,741) |  |  |
Other Segments [Member] |  |  |  |  |  |  |  |  |
Income (loss) from operations | $ (18,409) | $ (10,890) |  |  |  | $ (50,885) | $ (37,637) |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 + Details
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