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Note 6 - Goodwill, Intangible Assets and Long Term Assets (Tables)
3 Months Ended
Apr. 01, 2018
Notes Tables  
Schedule of Goodwill [Table Text Block]
   
Battery &
Energy
   
Communi-
cations
   
 
 
 
   
Products
   
Systems
   
Total
 
                         
Balance - December 31, 2016
  $
8,472
    $
11,493
    $
19,965
 
Effect of Foreign Currency Translation
   
83
     
-
     
83
 
Balance – April 2, 2017
   
8,555
     
11,493
     
20,048
 
Effect of Foreign Currency Translation
   
410
     
-
     
410
 
Balance - December 31, 2017
   
8,965
     
11,493
     
20,458
 
Effect of Foreign Currency Translation
   
240
     
-
     
240
 
Balance – April 1, 2018
  $
9,205
    $
11,493
    $
20,698
 
Schedule of Finite-Lived Intangible Assets [Table Text Block]
   
at
April 1, 2018
 
   
 
 
 
 
Accumulated
   
 
 
 
   
Cost
   
A
mortization
   
Net
 
                         
Trademarks
  $
3,415
    $
-
    $
3,415
 
Customer Relationships
   
6,720
     
4,277
     
2,443
 
Patents and Technology
   
5,586
     
4,641
     
945
 
Distributor Relationships
   
377
     
377
     
-
 
Trade Name
   
408
     
92
     
316
 
Total Other Intangible Assets
  $
16,506
    $
9,387
    $
7,119
 
   
at
December 31, 2017
 
   
 
 
 
 
Accumulated
   
 
 
 
   
Cost
   
A
mortization
   
Net
 
                         
Trademarks
  $
3,411
    $
-
    $
3,411
 
Customer Relationships
   
6,618
     
4,208
     
2,410
 
Patents and Technology
   
5,545
     
4,595
     
950
 
Distributor Relationships
   
377
     
377
     
-
 
Trade Name
   
393
     
79
     
314
 
Total Other Intangible Assets
  $
16,344
    $
9,259
    $
7,085