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Note 13 - Revenue (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Disaggregation of Revenue [Table Text Block]
    Three Months Ended September 30,   Nine Months Ended September 30,
    2018   2017   2018   2017
         
Testing   $
10,125
     $
9,188
     $
30,021
     $
27,330
  
Shipping/Collection (hair)    
803
      
778
      
2,439
      
2,295
  
Other    
88
      
83
      
278
      
317
  
Total Revenue   $
11,016
     $
10,049
     $
32,738
     $
29,942