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Note 9 - Line of Credit (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 27, 2014
Dec. 28, 2013
Sep. 27, 2014
Revolving Credit Facility [Member]
Sep. 28, 2013
Revolving Credit Facility [Member]
Feb. 20, 2009
Revolving Credit Facility [Member]
Feb. 20, 2009
Letter of Credit [Member]
Note 9 - Line of Credit (Details) [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity         $ 15 $ 5
Line of Credit Facility, Expiration Date     Aug. 31, 2016      
Long-term Line of Credit     0 0    
Letters of Credit Outstanding, Amount 0.8 0.8        
Line of Credit Facility, Remaining Borrowing Capacity     $ 14.2