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Note 6 - Acquisitions (Tables)
9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table Text Block]
Fiscal Year
Ended
 
Total
 
December 30, 2017
(after September 30, 2017)
  $
992
 
December 30, 2018
   
240
 
Estimated future contingent consideration payments
  $
1,232