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Note 10 - Revenue
 6 Months Ended
Jun. 30, 2019
Notes to Financial Statements  
Revenue from Contract with Customer [Text Block]
10.
Revenue
 
The table below disaggregates our external revenue by major source (in thousands).  For additional revenue detail relating to geographic breakdown of sales, see Note
11
– “Business Segment Reporting”.
 
    Three Months Ended
June 30,		   Six Months Ended
June 30,
    2019   2018   2019   2018
Testing   $
8,451
     $
9,864
     $
17,474
     $
19,896
  
Shipping/Collection (hair)    
777
      
812
      
1,511
      
1,636
  
Other    
61
      
111
      
126
      
190
  
Total Revenue   $
9,289
     $
10,787
     $
19,111
     $
21,722