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Note 9 - Segment and Enterprise-wide Disclosures (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
  

Three months ended

 
  

March 31,

 
  

2021

  

2020

 
  

(in thousands)

 

United States

 $21,968  $17,000 

Germany

  3,063   3,294 

Other countries

  10,852   10,257 
         

Net Sales

 $35,883  $30,551