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Note 6 - Acquisitions (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table Text Block]
Fiscal Years Ending
 
Total
 
December 29, 2018 (after June 30, 2018)
  $
482
 
December 28, 2019
   
526
 
January 2, 2021
   
725
 
Estimated future contingent consideration payments
  $
1,733