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Note 8 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 30, 2017
Notes Tables  
Lessee, Operating Lease, Disclosure [Table Text Block]
(in thousands)
 
2018
   
2019
   
2020
   
2021
   
2022
   
Thereafter
   
Total
 
Non-cancelable operating leases
  $
3,280
    $
2,930
    $
2,664
    $
2,636
    $
2,687
    $
7,264
    $
21,461