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Note 10 - Revenue - Revenue by Major Source (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Revenues $ 9,289 $ 10,787 $ 19,111 $ 21,722
Testing [Member]        
Revenues 8,451 9,864 17,474 19,896
Shipping/Collection (Hair) [Member]        
Revenues 777 812 1,511 1,636
Other Revenue [Member]        
Revenues $ 61 $ 111 $ 126 $ 190