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Note 10 - Revenue (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Disaggregation of Revenue [Table Text Block]
 
 
 
 
Three Months Ended
March 31,
    2019   2018
Testing   $
9,023
    $
9,997
 
Shipping/Collection (hair)    
735
     
824
 
Other    
64
     
114
 
Total Revenue   $
9,822
    $
10,935