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Note 8 - Goodwill and Other Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Intangible Assets and Goodwill [Table Text Block]
   
201
7
   
201
6
 
   
Historical Cost
   
Accumulated Amortization
   
Historical C
ost
   
Accumulated Amortization
 
Finite-lived intangible assets:
                               
Customer relationships
  $
7,966
    $
4,791
    $
11,885
    $
4,650
 
Technology and drawings
   
6,758
     
3,121
     
6,741
     
2,804
 
Other intangibles
   
1,866
     
1,021
     
1,723
     
942
 
Total finite-lived intangible ass
ets
   
16,590
     
8,933
     
20,349
     
8,396
 
Goodwill
   
27,551
     
-
     
28,030
     
-
 
Trade names and trademarks
   
2,710
     
-
     
2,888
     
-
 
Total
  $
46,851
    $
8,933
    $
51,267
    $
8,396
 
Schedule of Goodwill [Table Text Block]
   
Goodwill
 
Balance at
December 31, 2015
  $
24,559
 
Acquisitions
   
5,187
 
Impairment
   
(1,800
)
Foreign currency
   
84
 
Balance at December 31, 201
6
   
28,030
 
Acquisitions
   
-
 
Impairment
   
(925
)
Foreign currency
   
446
 
Balance at December 31, 201
7
  $
27,551