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Note 13. Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2012
Schedule of Asset Retirement Obligations [Table Text Block]
   
2012
   
2011
 
Balance, January 1
 
$
37,643
   
$
36,397
 
Changes in obligations due to changes in reclamation plans
 
—
   
387
 
Accretion expense
 
562
   
1,119
 
Payment of reclamation obligations
 
(170
)
 
(260
)
Balance, end of period
 
$
38,035
   
$
37,643