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Note 4 - Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Intangible assets	$ 25,250	$ 25,250
Goodwill	2,574	3,058
Istaroxime Drug Candidate [Member]
Intangible assets	22,340	22,340
Rostafuroxin Drug Candidate [Member]
Intangible assets	$ 2,910	$ 2,910

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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