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Note 5 - Goodwill and Other Intangible Assets (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
  

September 30, 2021

  

December 31, 2020

 
  

Gross

      

Net

  

Gross

      

Net

 
  

Carrying

  

Accumulated

  

Carrying

  

Carrying

  

Accumulated

  

Carrying

 
  

Value

  

Amortization

  

Value

  

Value

  

Amortization

  

Value

 
  

(in thousands)

 

Product technology and intellectual property

 $29,951  $10,167  $19,784  $29,951  $7,947  $22,004 

Trademarks, tradenames and licenses

  4,000   1,398   2,602   4,000   1,094   2,906 

Customer relationships

  38,525   7,352   31,173   38,525   5,424   33,101 

Other intangible assets

  1,767   1,096   671   1,767   873   894 
                         

Total identifiable intangible assets

 $74,243  $20,013  $54,230  $74,243  $15,338  $58,905 
Finite-lived Intangible Assets Amortization Expense [Table Text Block]
  

Three months ended September 30,

  

Nine months ended September 30,

 
  

2021

  

2020

  

2021

  

2020

 
  

(in thousands)

  

(in thousands)

 
                 

Amortization expense

 $1,547  $1,681  $4,675  $3,409 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
      

Year ended December 31,

     
  

2021

  

2022

  

2023

  

2024

  

2025

  

2026

 
  

(in thousands)

     
                         

Amortization expense

 $1,505  $5,975  $5,902  $5,706  $5,467  $5,001