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Note 16 - Segment and Related Information (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Revenue from External Customers by Geographic Areas [Table Text Block]
  

Year Ended December 31,

 

(in thousands)

 

2020

  

2019

 

United States

 $42,054  $47,792 

Europe

  29,938   35,128 

Asia

  23,884   25,041 

Rest of the world

  6,224   8,215 

Total revenues

 $102,100  $116,176 
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]
  

December 31,

 

(in thousands)

 

2020

  

2019

 

United States

 $36,568  $41,993 

Germany

  4,958   5,468 

Rest of the world

  3,092   3,048 

Total long-lived assets (a)

 $44,618  $50,509 
Schedule of Net Assets By Geographic Areas [Table Text Block]
  

December 31,

 

(in thousands)

 

2020

  

2019

 

United States

 $32,457  $37,726 

Germany

  18,697   17,340 

United Kingdom

  8,867   11,254 

Rest of the world

  16,660   15,374 

Total net assets

 $76,681  $81,694