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Note 13 - Revenue (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Disaggregation of Revenue [Table Text Block]
    Three Months Ended June 30,   Six Months Ended June 30,
    2018   2017   2018   2017
    (in 000's)   (in 000's)
Testing   $
9,864
     $
8,739
     $
19,896
     $
18,141
  
Shipping/Collection (hair)    
812
      
834
      
1,636
      
1,518
  
Other    
111
      
111
      
190
      
234
  
Total Revenue   $
10,787
     $
9,684
     $
21,722
     $
19,893