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Note 8 - Revenue (Tables)
6 Months Ended
Jun. 30, 2022
Notes Tables  
Disaggregation of Revenue [Table Text Block]
  

Three Months Ended

  

Six Months Ended

 
  

June 30,

  

June 30,

 
  

2022

  

2021

  

2022

  

2021

 

Testing

 $5,480  $5,367  $11,204  $10,416 

Shipping/Collection (hair)

  1,001   680   1,751   1,295 

Other

  32   40   66   89 

Total Revenue

 $6,513  $6,087  $13,021  $11,800