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Note 4 - Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Intangible Assets and Goodwill [Table Text Block]
   March 31,   December 31, 

(in thousands)

 

2022

  

2021

 
         

Istaroxime drug candidate

 $22,340  $22,340 

Rostafuroxin drug candidate

  9,730   9,730 

Intangible assets

  32,070   32,070 
         

Goodwill

 $15,682  $15,682