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Note 10 - Revenue (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Disaggregation of Revenue [Table Text Block]
    Three Months Ended   Nine Months Ended
    September 30,   September 30,
    2019   2018   2019   2018
Testing   $
9,069
     $
10,125
     $
26,543
     $
30,022
  
Shipping/Collection (hair)    
714
      
803
      
2,225
      
2,438
  
Other    
69
      
88
      
195
      
278
  
Total Revenue   $
9,852
     $
11,016
     $
28,963
     $
32,738