Note 11. Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2013
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
   
Three Months Ended
 
   
March 31, 2013
   
March 25, 2012
 
   
(in thousands)
 
             
Income tax expense
  $ 2,388     $ 3,445