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Note 13 - Related Party Transactions (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Aug. 31, 2020
May 31, 2020
Dec. 31, 2021
Dec. 31, 2020
AEROSURF Funding Term Sheet [Member] | Lee’s Pharmaceutical Holdings Limited [Member]        
Nonrefundable Payments $ 2,800   $ 1,000  
Due to Related Parties, Total     3,800 $ 2,800
Contractual Obligation, Total     $ 0  
Research and Development Expenses for Services Provided [Member] | Lee’s Pharmaceutical Holdings Limited [Member]        
Related Party Transaction, Expenses from Transactions with Related Party       $ 200
May 2020 Public Offering [Member] | Panacea [Member]        
Related Party Transaction, Amounts of Transaction   $ 2,000    
Lee’s Pharmaceutical Holdings Limited [Member] | Windtree Therapeutics [Member]        
Ownership Percentage     17.00% 29.00%
Panacea [Member] | Windtree Therapeutics [Member]        
Ownership Percentage     8.00% 14.00%