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Note 5 - Goodwill and Other Intangibles (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Goodwill [Table Text Block]
Balance at December 31, 2019
  $
39,951
 
         
Additions for acquisitions
   
59
 
Effects of currency exchange
   
(237
)
         
Balance at March 31, 2020
  $
39,773
 
Schedule of Finite-Lived Intangible Assets [Table Text Block]
   
March 31, 2020
   
December 31, 2019
 
   
Gross
   
 
 
 
 
Net
   
Gross
   
 
 
 
 
Net
 
   
Carrying
   
Accumulated
   
Carrying
   
Carrying
   
Accumulated
   
Carrying
 
   
Value
   
Amortization
   
Value
   
Value
   
Amortization
   
Value
 
   
(in thousands)
 
Product technology and intellectual property
  $
13,502
    $
6,038
    $
7,464
    $
13,502
    $
5,722
    $
7,780
 
Trademarks, tradenames and licenses
   
1,807
     
749
     
1,058
     
1,807
     
702
     
1,105
 
Customer relationships
   
18,215
     
3,700
     
14,515
     
18,215
     
3,364
     
14,851
 
Other intangible assets
   
1,663
     
641
     
1,022
     
1,725
     
568
     
1,157
 
                                                 
Total identifiable intangible assets
  $
35,187
    $
11,128
    $
24,059
    $
35,249
    $
10,356
    $
24,893
 
Finite-lived Intangible Assets Amortization Expense [Table Text Block]
   
Three months ended March 31,
 
   
2020
   
2019
 
   
(in thousands)
 
                 
Amortization expense
  $
834
    $
555
 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
   
Year ended December 31,
 
   
2020
   
2021
   
2022
   
2023
   
2024
   
2025
 
   
(in thousands)
         
                                                 
Amortization expense
  $
2,391
    $
2,956
    $
2,751
    $
2,677
    $
2,478
    $
2,253