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Note 3 - Share Repurchase Program (Details Textual) - USD ($)
$ in Thousands
9 Months Ended 25 Months Ended
Sep. 25, 2016
Sep. 27, 2015
Jun. 02, 2016
May 01, 2014
Maximum [Member]        
Stock Repurchase Program, Number of Shares Authorized to be Repurchased     3,400,000 1,800,000
Treasury Stock, Shares, Acquired 149,904 2,225,437 2,592,095  
Treasury Stock, Value, Acquired, Cost Method $ 603 $ 9,162 $ 10,480