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Note 2 - Investments and Restricted Cash (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2015 | Sep. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Note 2 - Investments and Restricted Cash (Details) [Line Items] |  |  |  |  |  |  |
Long-term Investments |  | $ 2,003 |  |  | $ 2,003 |  | $ 4,920
Available-for-sale Securities, Amortized Cost Basis |  | 4,200 |  |  | 4,200 |  | 7,300
Other than Temporary Impairment Losses, Investments |  |  | $ 2,800 |  |  |  |
Payments to Acquire Investments |  |  | $ 900 |  | 947 | $ 580 |
Unrealized Gain (Loss) on Investments |  | (100) |  | $ (2,830) | (3,226) | $ (2,750) |
Restricted Investments |  | 1,000 |  |  | 1,000 |  | $ 900
Non-Current Investments Held Having Net Loss Position [Member] |  |  |  |  |  |  |
Note 2 - Investments and Restricted Cash (Details) [Line Items] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax |  | (2,200) |  |  | (2,200) |  |
Non-Current Investments Held Having Net Gain Position [Member] |  |  |  |  |  |  |
Note 2 - Investments and Restricted Cash (Details) [Line Items] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax |  | $ 6 |  |  | $ 6 |  |
Revett Mining Company, Inc. [Member] |  |  |  |  |  |  |
Note 2 - Investments and Restricted Cash (Details) [Line Items] |  |  |  |  |  |  |
Increase (Decrease) in Cost Basis of Investments | $ (500) |  |  |  |  |  |
Unrealized Gain (Loss) on Investments | $ (200) |  |  |  |  |  |

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- Definition Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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