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Note 9 - Segment and Enterprise-wide Disclosures (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
  

Three months ended

  

Nine months ended

 
  

September 30,

  

September 30,

 
  

2021

  

2020

  

2021

  

2020

 
  

(in thousands)

  

(in thousands)

 

United States

 $23,313  $22,633  $70,453  $53,168 

Germany

  3,369   3,384   9,586   9,377 

Other countries

  11,686   10,399   34,882   29,273 
                 

Net Sales

 $38,368  $36,416  $114,921  $91,818