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Note 7 - Goodwill, Intangible Assets and Long Term Assets (Tables)
9 Months Ended
Sep. 30, 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
   
416
     
-
     
416
 
Balance – October 1, 2017
   
8,888
     
11,493
     
20,381
 
Effect of Foreign Currency Translation
   
77
     
-
     
77
 
Balance - December 31, 2017
   
8,965
     
11,493
     
20,458
 
Effect of Foreign Currency Translation
   
(257
)    
-
     
(257
)
Balance – September 30, 2018
  $
8,708
    $
11,493
    $
20,201
 
Schedule of Finite-Lived Intangible Assets [Table Text Block]
   
at
September 30
, 2018
 
   
 
 
 
 
Accumulated
   
 
 
 
   
Cost
   
A
mortization
   
Net
 
                         
Trademarks
  $
3,405
    $
-
    $
3,405
 
Customer Relationships
   
6,529
     
4,352
     
2,177
 
Patents and Technology
   
5,509
     
4,696
     
813
 
Distributor Relationships
   
377
     
377
     
-
 
Trade Name
   
379
     
104
     
275
 
Total Other Intangible Assets
  $
16,199
    $
9,529
    $
6,670
 
   
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
 
Finite-lived Intangible Assets Amortization Expense [Table Text Block]
   
Three-month periods ended
   
Nine
-month periods ended
 
   
September 30
,
   
October 1
,
   
September 30
,
   
October 1
,
 
   
2018
   
2017
   
2018
   
2017
 
Amortization included in:
                               
Research and development
  $
36
    $
42
    $
111
    $
123
 
Selling, general and administrative
   
61
     
64
     
189
     
192
 
Total amortization expense
  $
97
    $
106
    $
300
    $
315