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Note 3 - Income Taxes
3 Months Ended
Mar. 31, 2013
Income Tax Disclosure [Text Block]
Note 3.   Income Taxes

Major components of our income tax provision for the three months ended March 31, 2013 and 2012 are as follows (in thousands):

   
Three Months Ended
March 31,
 
   
2013
   
2012
 
Current:
               
Federal
  $ 2,231     $ 3,672  
State
    906       551  
Foreign
    115       115  
Total current income tax provision
    3,252       4,338  
                 
Deferred:
               
Federal and state deferred income tax provision
    4,163       2,977  
Total income tax provision
  $ 7,415     $ 7,315  

Our ability to utilize our deferred tax assets depends on future taxable income generated from operations. For the three months ended March 31, 2013, there were no circumstances that caused us to change our assessment of the ability to generate sufficient future taxable income to realize the currently recognized U.S. deferred tax assets.  After utilization of $4.0 million during the first three months of 2013, the net deferred tax asset at March 31, 2013 was $111.8 million. It is possible that the valuation allowance on our deferred tax asset will change in the future as a result of the analysis of our long-range forecasts, with a resulting tax provision or benefit.

The current income tax provisions for the three months ended March 31, 2013 and 2012 vary from the amounts that would have resulted from applying the statutory income tax rate to pre-tax income primarily due to the effects of percentage depletion for all periods presented and the change in valuation allowance related to foreign operations.