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Note 17 - Guarantor Subsidiaries (Details) - Condensed Consolidating Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Cash flows from operating activities | $ 26,644 | $ 69,016 | $ 69,891
Cash flows from investing activities: |  |  |
Additions to properties, plants, and equipment | (150,736) | (113,096) | (87,546)
Acquisition of Aurizon Mines Ltd. | (321,117) |  |
Cash flows from financing activities: |  |  |
Borrowings on debt | 490,000 |  |
Changes in cash and cash equivalents | 21,191 | (75,479) | (17,143)
Effect of exchange rate changes on cash | (4,905) |  |
Cash and cash equivalents at beginning of year | 190,984 | 266,463 | 283,606
Cash and cash equivalents at end of year | 212,175 | 190,984 | 266,463
Parent [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Cash flows from operating activities | (9,958) | 49,295 | 105,740
Cash flows from investing activities: |  |  |
Additions to properties, plants, and equipment | (1,535) | (618) | (2)
Acquisition of Aurizon Mines Ltd. | (498,705) |  |
Other investing activities, net |  | (48,815) | (38,356)
Cash flows from financing activities: |  |  |
Dividends paid to stockholders | (6,543) | (17,673) | (9,414)
Borrowings on debt | 490,000 |  |
Other financing activity | 20,746 | 52,227 | (150,118)
Changes in cash and cash equivalents | (5,995) | 34,416 | (92,150)
Cash and cash equivalents at beginning of year | 132,266 | 97,850 | 190,000
Cash and cash equivalents at end of year | 126,271 | 132,266 | 97,850
Guarantor Subsidiaries [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Cash flows from operating activities | 17,940 | 42,957 | 79,166
Cash flows from investing activities: |  |  |
Additions to properties, plants, and equipment | (107,893) | (107,425) | (87,454)
Other investing activities, net | (11) | 891 | (1,659)
Cash flows from financing activities: |  |  |
Payments on debt | (7,039) | (5,878) | (2,938)
Other financing activity | 79,937 | (41,903) | 88,193
Changes in cash and cash equivalents | (17,066) | (111,358) | 75,308
Cash and cash equivalents at beginning of year | 57,075 | 168,433 | 93,125
Cash and cash equivalents at end of year | 40,009 | 57,075 | 168,433
Non-Guarantor Subsidiaries [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Cash flows from operating activities | (20,129) | (14,296) | (12,449)
Cash flows from investing activities: |  |  |
Additions to properties, plants, and equipment | (41,308) | (5,053) | (90)
Acquisition of Aurizon Mines Ltd. | 177,588 |  |
Other investing activities, net | (3,633) | (5,835) | 1
Cash flows from financing activities: |  |  |
Payments on debt |  | (12) |
Other financing activity | (63,361) | 26,659 | 12,237
Changes in cash and cash equivalents | 49,157 | 1,463 | (301)
Effect of exchange rate changes on cash | (4,905) |  |
Cash and cash equivalents at beginning of year | 1,643 | 180 | 481
Cash and cash equivalents at end of year | 45,895 | 1,643 | 180
Consolidation, Eliminations [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Cash flows from operating activities | 38,791 | (8,940) | (102,566)
Cash flows from investing activities: |  |  |
Other investing activities, net |  | 48,817 | 47,741
Cash flows from financing activities: |  |  |
Other financing activity | (38,791) | (39,877) | 54,825
Consolidated [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Cash flows from operating activities | 26,644 | 69,016 | 69,891
Cash flows from investing activities: |  |  |
Additions to properties, plants, and equipment | (150,736) | (113,096) | (87,546)
Acquisition of Aurizon Mines Ltd. | (321,117) |  |
Other investing activities, net | (3,644) | (4,942) | 7,727
Cash flows from financing activities: |  |  |
Dividends paid to stockholders | (6,543) | (17,673) | (9,414)
Borrowings on debt | 490,000 |  |
Payments on debt | (7,039) | (5,890) | (2,938)
Other financing activity | (1,469) | (2,894) | 5,137
Changes in cash and cash equivalents | 26,096 | (75,479) | (17,143)
Effect of exchange rate changes on cash | (4,905) |  |
Cash and cash equivalents at beginning of year | 190,984 | 266,463 | 283,606
Cash and cash equivalents at end of year | $ 212,175 | $ 190,984 | $ 266,463

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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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