Note 14 - Guarantor Subsidiaries (Details) - Condensed Consolidating Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Condensed Cash Flow Statements, Captions [Line Items]
Cash flows from operating activities	$ 5,080	$ 66,488
Cash flows from investing activities:
Additions to properties, plants, and equipment	(112,806)	(81,318)
Acquisition of Aurizon Mines	(321,117)
Other investing activities, net	(3,876)	(2,517)
Cash flows from financing activities:
Dividends paid to shareholders	(5,548)	(11,114)
Borrowings on debt	490,000
Proceeds from (payments on) debt	(5,171)	(4,561)
Other financing activity, net	(1,530)	(1,247)
Effect of exchange rates on cash	1,820
Changes in cash and cash equivalents	46,852	(34,269)
Cash and cash equivalents	237,836	232,194
Consolidation, Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash flows from operating activities		(2,071)
Cash flows from investing activities:
Other investing activities, net		45,528
Cash flows from financing activities:
Other financing activity, net		(43,457)
Parent Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash flows from operating activities	(7,020)	36,246
Cash flows from investing activities:
Additions to properties, plants, and equipment	(1,169)	(519)
Acquisition of Aurizon Mines	(498,705)
Other investing activities, net		(45,528)
Cash flows from financing activities:
Dividends paid to shareholders	(5,548)	(11,114)
Borrowings on debt	490,000
Other financing activity, net	6,431	46,135
Changes in cash and cash equivalents	(16,011)	25,220
Cash and cash equivalents	116,255	123,070
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash flows from operating activities	57,833	38,749
Cash flows from investing activities:
Additions to properties, plants, and equipment	(88,807)	(80,313)
Other investing activities, net	103	3,403
Cash flows from financing activities:
Proceeds from (payments on) debt	(5,171)	(4,554)
Other financing activity, net	7,936	(17,312)
Changes in cash and cash equivalents	(28,106)	(60,027)
Cash and cash equivalents	29,864	108,406
Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash flows from operating activities	(45,733)	(6,436)
Cash flows from investing activities:
Additions to properties, plants, and equipment	(22,830)	(486)
Acquisition of Aurizon Mines	177,588
Other investing activities, net	(3,979)	(5,920)
Cash flows from financing activities:
Proceeds from (payments on) debt		(7)
Other financing activity, net	(15,897)	13,387
Effect of exchange rates on cash	1,820
Changes in cash and cash equivalents	90,969	538
Cash and cash equivalents	$ 91,717	$ 718