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Note 8 - Income Taxes
 3 Months Ended
Mar. 31, 2013
Income Tax Disclosure [Text Block]
8.         Income Taxes

For the three-month periods ended March 31, 2013 and 2012, our income tax expense and effective income tax rates were as follows (dollars in thousands):

   
Three Months Ended March 31,
 
   
2013
   
2012
 
Income tax expense
  $ 1,651     $ 2,289  
Effective income tax rate
    65.5 %     40.4 %

We estimate our differences between taxable income or loss and recorded income or loss on an annual basis. Our tax provision for each quarter is based upon these full year projections which are revised each reporting period. These projections incorporate estimates of permanent differences between U.S. GAAP income or loss and taxable income or loss, state income taxes and adjustments to our liability for unrecognized tax benefits to adjust our statutory Federal income tax rate of 35.0% to our effective income tax rate.  For the three-month period ended March 31, 2013, these estimates increased or decreased our statutory Federal income tax rate of 35.0% to our effective income tax rate of 65.5% as follows: an adjustment specific to the current quarter resulting from the expiration of certain unexercised stock options added 24.6%, state income taxes added 4.7%, permanent differences between our U.S. GAAP income and taxable income added 1.6% and adjustments to our reserve for uncertain tax positions resulted in a reduction of 0.4%. For the three-month period ended March 31, 2012, these estimates increased or decreased our statutory Federal income tax rate of 35.0% to our effective income tax rate of 40.4% as follows: state income taxes added 6.3%, permanent differences between our U.S. GAAP income and taxable income added 0.6%, and adjustments to our reserve for uncertain tax positions resulted in a reduction of 1.5%.