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Note 9 - Restructured Debt Liability (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
   
June 30,
   
December 31,
 
(in thousands)
 
2018
   
2017
 
                 
Restructured debt liability - contingent milestone payments
  $
15,000
    $
15,000