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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 [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