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Note 6. Investment in Rock Ohio Ventures, LLC (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 30, 2012
Note 6. Investment in Rock Ohio Ventures, LLC (Details) [Line Items]    
Cost Method Investments $ 20,997 $ 20,161
Rock Ohio Ventures [Member]
   
Note 6. Investment in Rock Ohio Ventures, LLC (Details) [Line Items]    
Cost Method Investments $ 21,000 $ 20,200