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Note 6 - Acquisitions (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table Text Block]
Fiscal Years Ending
 
Total
 
December 29, 2018 (after March 31, 2018)
  $
741
 
December 28, 2019
   
625
 
January 2, 2021
   
725
 
Estimated future contingent consideration payments
  $
2,091