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Note 3 - Properties, Plants, Equipment and Mineral Interests, and Lease Commitments (Tables)
12 Months Ended
Dec. 31, 2012
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
   

December 31,

 
   

2012

   

2011

 

Mining properties, including asset retirement obligations

  $ 294,573     $ 286,873  

Development costs

    151,504       123,772  

Plants and equipment

    419,377       383,045  

Land

    15,788       11,188  

Mineral interests

    375,028       383,491  

Construction in progress

    176,925       125,045  
      1,433,195       1,313,414  

Less accumulated depreciation, depletion and amortization

    436,536       390,202  

Net carrying value

  $ 996,659     $ 923,212  
Operating Leases of Lessee Disclosure [Table Text Block]

Year ending December 31,

       

2013

  $ 3,087  

2014

    3,114  

2015

    1,434  

2016

    1,438  

2017

    1,056  

Thereafter

    3,848  

Total

  $ 13,977