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Note 6 - Acquisitions (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table Text Block]
Fiscal Year
 
Total
 
December 30, 2017
  $
1,061
 
December 30, 2018
   
170
 
Estimated future contingent consideration payments
  $
1,231