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Note 9 - Revenue (Tables)
 6 Months Ended
Jun. 30, 2020
Notes Tables  
Disaggregation of Revenue [Table Text Block]
    Three Months Ended   Six Months Ended
    June 30,   June 30,
    2020   2019   2020   2019
Testing   $
2,941
     $
8,451
     $
9,774
     $
17,474
  
Shipping/Collection (hair)    
353
      
777
      
1,013
      
1,511
  
Other    
20
      
61
      
64
      
126
  
Total Revenue   $
3,314
     $
9,289
     $
10,851
     $
19,111