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Note 4 - Accounting Policies - Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Intangible assets $ 32,070 $ 32,070
Goodwill 15,682 15,682
Istaroxime Drug Candidate [Member]    
Intangible assets 22,340 22,340
Rostafuroxin Drug Candidate [Member]    
Intangible assets $ 9,730 $ 9,730