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Note 13 - Guarantor Subsidiaries (Details) - Condensed Consolidating Statements of Cash Flows (USD $) | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013
Condensed Cash Flow Statements, Captions [Line Items] |  |
Cash flows from operating activities | $ 57,029,000 | $ 10,275,000
Cash flows from investing activities: |  |
Additions to properties, plants, and equipment | (57,461,000) | (60,291,000)
Acquisition of Aurizon Mines |  | (321,117,000)
Other investing activities, net | 4,572,000 | (3,786,000)
Cash flows from financing activities: |  |
Dividends paid to stockholders | (1,991,000) | (4,553,000)
Borrowings on debt |  | 490,000,000
Payments on debt | (4,525,000) | (3,425,000)
Other financing activity | 12,034,000 | (1,712,000)
Effect of exchange rate changes on cash | 250,000 |
Changes in cash and cash equivalents | 9,908,000 | 105,391,000
Cash and cash equivalents | 222,083,000 | 296,375,000
Consolidation, Eliminations [Member] |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |
Cash flows from operating activities | 1,574,000 |
Cash flows from financing activities: |  |
Other financing activity | (1,574,000) |
Parent Company [Member] |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |
Cash flows from operating activities | 10,632,000 | (7,524,000)
Cash flows from investing activities: |  |
Additions to properties, plants, and equipment | (736,000) | (229,000)
Acquisition of Aurizon Mines |  | (498,705,000)
Cash flows from financing activities: |  |
Dividends paid to stockholders | (1,991,000) | (4,553,000)
Borrowings on debt |  | 490,000,000
Other financing activity | 26,198,000 | (2,706,000)
Changes in cash and cash equivalents | 34,103,000 | (23,717,000)
Cash and cash equivalents | 160,374,000 |
Guarantor Subsidiaries [Member] |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |
Cash flows from operating activities | 46,829,000 | 54,148,000
Cash flows from investing activities: |  |
Additions to properties, plants, and equipment | (32,891,000) | (54,128,000)
Other investing activities, net | 238,000 | 102,000
Cash flows from financing activities: |  |
Payments on debt | (4,525,000) | (3,425,000)
Other financing activity | (11,021,000) | 1,681,000
Changes in cash and cash equivalents | (1,370,000) | (1,622,000)
Cash and cash equivalents | 38,639,000 |
Non-Guarantor Subsidiaries [Member] |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |
Cash flows from operating activities | (2,006,000) | (36,349,000)
Cash flows from investing activities: |  |
Additions to properties, plants, and equipment | (23,834,000) | (5,934,000)
Acquisition of Aurizon Mines |  | 177,588,000
Other investing activities, net | 4,334,000 | (3,888,000)
Cash flows from financing activities: |  |
Other financing activity | (1,569,000) | (687,000)
Effect of exchange rate changes on cash | 250,000 |
Changes in cash and cash equivalents | (22,825,000) | 130,730,000
Cash and cash equivalents | 23,070,000 |
Ending Balance [Member] | Parent Company [Member] |  |
Cash flows from financing activities: |  |
Cash and cash equivalents | 160,374,000 | 108,549,000
Ending Balance [Member] | Guarantor Subsidiaries [Member] |  |
Cash flows from financing activities: |  |
Cash and cash equivalents | 38,639,000 | 55,453,000
Ending Balance [Member] | Non-Guarantor Subsidiaries [Member] |  |
Cash flows from financing activities: |  |
Cash and cash equivalents | 23,070,000 | 132,373,000
Ending Balance [Member] |  |
Cash flows from financing activities: |  |
Cash and cash equivalents | $ 222,083,000 | $ 296,375,000

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450594&loc=d3e33268-110906 + Details
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- Definition Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450594&loc=d3e33268-110906 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585 + Details
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