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Note 13 - Restructured Debt Liability (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
   
December 31,
   
December 31,
 
(in thousands)
 
2019
   
2018
 
                 
Restructured debt liability - contingent milestone payments
  $
15,000
    $
15,000