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Note 11 - Business Segments and Significant Customers (Details Textual) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Number of Reportable Segments | 4 |  |
Derivative, Loss on Derivative | $ 6,000 | $ 14,200 |
Derivative, Gain on Derivative |  |  | $ 6,200
Employee Labor Strike Related Costs | 21,301 |  |
Lucky Friday [Member] | Suspension Costs [Member] |  |  |
Employee Labor Strike Related Costs | 17,100 |  |
Lucky Friday [Member] | Non-cash Depreciation Expense [Member] |  |  |
Employee Labor Strike Related Costs | $ 4,200 |  |

X
- Definition Amount of expenses associated with a labor strike by a portion of the reporting entity's workforce. + References No definition available. + Details
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X
- Definition Amount of increase in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 + Details
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- Definition Amount of decrease in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Details
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X
- Details
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X
- Details
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