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Note 3 - Properties, Plants, Equipment and Mineral Interests, and Lease Commitments (Tables)
12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
   

December 31,

 
   

2013

   

2012

 

Mining properties, including asset retirement obligations

  $ 312,692     $ 294,573  

Development costs

    204,598       151,504  

Plants and equipment

    626,818       419,377  

Land

    15,799       15,788  

Mineral interests

    946,144       375,028  

Construction in progress

    200,921       176,925  
      2,306,972       1,433,195  

Less accumulated depreciation, depletion and amortization

    515,371       436,536  

Net carrying value

  $ 1,791,601     $ 996,659  
Operating Leases of Lessee Disclosure [Table Text Block]

Year ending December 31,

       

2014

  $ 3,347  

2015

    1,353  

2016

    1,370  

2017

    985  

2018

    917  

Thereafter

    2,659  

Total

  $ 10,631