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Note 16 - Guarantor Subsidiaries (Details) - Condensed Consolidating Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Cash flows from operating activities | $ 106,445 | $ 83,124 | $ 26,644
Cash flows from investing activities: |  |  |
Additions to properties, plants, and equipment | (137,443) | (122,537) | (150,736)
Acquisition of Aurizon Mines Ltd. | (809) |  | (321,117)
Cash flows from financing activities: |  |  |
Borrowings on debt |  |  | 490,000
Effect of exchange rates on cash | (5,152) | (3,783) | (4,905)
Changes in cash and cash equivalents | (54,456) | (2,510) | 21,191
Cash and cash equivalents at beginning of year | 209,665 | 212,175 | 190,984
Cash and cash equivalents at end of year | 155,209 | 209,665 | 212,175
Consolidation, Eliminations [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Cash flows from operating activities | (2,629) | (75,323) | 38,791
Cash flows from financing activities: |  |  |
Other financing activity | 2,629 | 75,323 | (38,791)
Consolidated [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Cash flows from operating activities | 106,445 | 83,124 | 26,644
Cash flows from investing activities: |  |  |
Additions to properties, plants, and equipment | (137,443) | (122,537) | (150,736)
Acquisition of Aurizon Mines Ltd. |  |  | (321,117)
Other investing activities | (1,163) | 4,182 | (3,644)
Cash flows from financing activities: |  |  |
Dividends paid to stockholders | (4,291) | (4,099) | (6,543)
Borrowings on debt |  |  | 490,000
Payments on debt | (10,851) | (9,137) | (7,039)
Other financing activity | (2,001) | 49,740 | (1,469)
Effect of exchange rates on cash | (5,152) | (3,783) | (4,905)
Changes in cash and cash equivalents | (54,456) | (2,510) | 21,191
Cash and cash equivalents at beginning of year | 209,665 | 212,175 | 190,984
Cash and cash equivalents at end of year | 155,209 | 209,665 | 212,175
Parent Company [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Cash flows from operating activities | (56,036) | 38,270 | (9,958)
Cash flows from investing activities: |  |  |
Additions to properties, plants, and equipment | (1,355) | (1,336) | (1,535)
Acquisition of Aurizon Mines Ltd. |  |  | (498,705)
Other investing activities | (748) |  |
Cash flows from financing activities: |  |  |
Dividends paid to stockholders | (4,291) | (4,099) | (6,543)
Borrowings on debt |  |  | 490,000
Other financing activity | 9,712 | (12,221) | 20,746
Changes in cash and cash equivalents | (52,718) | 20,614 | (5,995)
Cash and cash equivalents at beginning of year | 146,885 | 126,271 | 132,266
Cash and cash equivalents at end of year | 94,167 | 146,885 | 126,271
Guarantor Subsidiaries [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Cash flows from operating activities | 101,254 | 61,900 | 17,940
Cash flows from investing activities: |  |  |
Additions to properties, plants, and equipment | (97,684) | (68,859) | (107,893)
Other investing activities | 637 | 417 | (11)
Cash flows from financing activities: |  |  |
Payments on debt | (12,405) | (9,137) | (7,039)
Other financing activity | 17,066 | 9,494 | 79,937
Changes in cash and cash equivalents | 8,868 | (6,185) | (17,066)
Cash and cash equivalents at beginning of year | 33,824 | 40,009 | 57,075
Cash and cash equivalents at end of year | 42,692 | 33,824 | 40,009
Non-Guarantor Subsidiaries [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Cash flows from operating activities | 63,856 | 58,277 | (20,129)
Cash flows from investing activities: |  |  |
Additions to properties, plants, and equipment | (38,404) | (52,342) | (41,308)
Acquisition of Aurizon Mines Ltd. |  |  | 177,588
Other investing activities | (1,052) | 3,765 | (3,633)
Cash flows from financing activities: |  |  |
Payments on debt | 1,554 |  |
Other financing activity | (31,408) | (22,856) | (63,361)
Effect of exchange rates on cash | (5,152) | (3,783) | (4,905)
Changes in cash and cash equivalents | (10,606) | (16,939) | 44,252
Cash and cash equivalents at beginning of year | 28,956 | 45,895 | 1,643
Cash and cash equivalents at end of year | $ 18,350 | $ 28,956 | $ 45,895

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