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Note 9 - Senior Notes, Credit Facilities, Note Payable and Capital Leases (Details) - USD ($) $ in Thousands |  | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 12, 2013 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Aug. 06, 2015 | Feb. 28, 2014
Note 9 - Senior Notes, Credit Facilities, Note Payable and Capital Leases (Details) [Line Items] |  |  |  |  |  |
Proceeds from Issuance of Senior Long-term Debt | $ 490,000 |  |  |  |  |
Underwriting Discount on Senior Notes | 2.00% |  |  |  |  |
Capital Leases Including Purchase Option |  | $ 19,000 |  |  |  |
Capital Lease Obligations, Current |  | 9,492 |  | $ 9,491 |  |
Capital Lease Obligations, Noncurrent |  | 9,485 |  | 13,650 |  |
Capital Lease Obligations |  | 18,977 |  | 23,100 |  |
Capital Leases, Future Minimum Payments Due |  | 19,814 |  |  |  |
Capital Leases, Future Minimum Payments, Interest Included in Payments |  | 837 |  |  |  |
Senior Notes [Member] |  |  |  |  |  |
Note 9 - Senior Notes, Credit Facilities, Note Payable and Capital Leases (Details) [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount | $ 500,000 |  |  |  |  |
Pension Contributions |  |  |  | $ 6,500 |  |
Debt Instrument, Unamortized Discount | $ 10,000 | 7,100 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.875% |  |  |  |  |
Interest Expense, Debt |  | 10,000 | $ 8,600 |  |  |
Interest Costs Capitalized |  | $ 17,200 | $ 18,600 |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  | 100.00% |  |  |  |
Percentage of Notes Redeemable |  | 35.00% |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 101.00% |  |  |  |
Notes Payable |  | $ 499,400 |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |
Note 9 - Senior Notes, Credit Facilities, Note Payable and Capital Leases (Details) [Line Items] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | $ 100,000
Long-term Line of Credit |  | 0 |  |  |  |
Revolving Credit Facility [Member] | Subsequent Event [Member] |  |  |  |  |  |
Note 9 - Senior Notes, Credit Facilities, Note Payable and Capital Leases (Details) [Line Items] |  |  |  |  |  |
Long-term Line of Credit |  |  |  |  | $ 0 |
Revett Mining Company, Inc. [Member] |  |  |  |  |  |
Note 9 - Senior Notes, Credit Facilities, Note Payable and Capital Leases (Details) [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 6.25% |
Notes Payable |  | 3,800 |  |  |  |
Notes Payable, Current |  | 2,000 |  |  |  |
Notes Payable, Noncurrent |  | $ 1,800 |  |  |  |

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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