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Note 10 - Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
Six
-Month P
eriod
 E
nded
 
   
June 30,
2019
   
July 1,
2018
 
Accrued warranty obligations – beginning
  $
95
    $
149
 
Assumed warranty obligations – SWE
   
145
     
-
 
Accruals for warranties issued
   
18
     
7
 
Settlements made
   
(22
)    
(5
)
Accrued warranty obligations – ending
  $
236
    $
151