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Note 11 - Licensing and Research Funding Agreements (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jan. 12, 2024
Jun. 30, 2019
Dec. 31, 2021
Dec. 31, 2022
Aug. 17, 2022
Sep. 30, 2020
Mar. 18, 2020
AEROSURF Funding Term Sheet [Member] | Lee’s Pharmaceutical Holdings Limited [Member]              
Nonrefundable Payments, Maximum Financing to Be Received Under Special Circumstances           $ 2,800  
Term Sheet With Lee [Member]              
Proceeds for Payments to Develop Product     $ 1,000        
Financing of Product, Percent of Financing That Must be Repaid to Discontinue Revenue Sharing             125.00%
Financing of Product, Percent of Revenue Shared With Financer             50.00%
Term Sheet With Lee [Member] | Other Liabilities [Member]              
Contractual Obligation, Total       $ 3,800      
A&R License Agreement With Lee [Member]              
Proceeds for Payments to Develop Product   $ 1,000          
Maximum Amount May be Received for Potential Milestone Payments         $ 78,900    
License Agreement with Lee’s Pharmaceutical (HK) Ltd. [Member]              
Maximum Amount May be Received for Potential Milestone Payments $ 3,100            
Maximum Amount May be Received for Sales Milestone Payments $ 135,250            
Royalties to be Received, Period After First Commercial Sale (Year) 10 years            
Royalty Rate Reduction Percentage 50.00%