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Note 6 - License Revenue with Affiliate (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,
 
(in thousands)
 
2018
   
2017
   
2018
   
2017
 
                                 
License revenue with affiliate
  $
356
    $
-
    $
560
    $
-