Note 4 - Environmental and Reclamation Activities (Details) - Accrued Reclamation and Closure Cost Liability Activity (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accrued Reclamation and Closure Cost Liability Activity [Abstract]
Balance	$ 105,191	$ 113,215	$ 153,811
Accruals for estimated costs	9,952	2,250	4,325
Liability addition due to acquisition of the Casa Berardi unit		7,998
Revision of estimated cash flows due to changes in reclamation plans	675		(3,738)
Payment of reclamation obligations	(58,568)	(18,272)	(41,183)
Balance	$ 57,250	$ 105,191	$ 113,215