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Note 9 - Related-party Transactions (Details Textual) - USD ($)
$ in Thousands
6 Months Ended
Feb. 18, 2019
Aug. 11, 2017
Jun. 30, 2024
Jun. 30, 2023
Related Party, Eyemax LLC [Member] | The Eyemax Agreement [Member]        
Related Party Transaction, Terms (Year)   10 years    
Related Party Transaction, Terms, Renewal (Year)   2 years    
Related Party, Eyemax LLC [Member] | The Eyemax Agreement [Member] | Royalty [Member]        
Related Party Transaction, Rate   10.00%    
Related Party, Eyemax LLC [Member] | The Eyemax Agreement [Member] | Research and Development Expense [Member]        
Related Party Transaction, Amounts of Transaction   $ 250    
Related Party, Eyemax LLC [Member] | Covenant Based on Sale of First Commercial Product [Member]        
Related Party Transaction, Amounts of Transaction   $ 500    
Related Party, Eyemax LLC [Member] | The Amended Agreement [Member]        
Related Party Transaction, Amounts of Transaction     $ 0  
Revenues     $ 1,840  
Related Party, Eyemax LLC [Member] | The Amended Agreement [Member] | Covenant Based on Approval by The FDA [Member]        
Related Party Transaction, Amounts of Transaction $ 250      
Related Party, Eyemax LLC [Member] | The Amended Agreement [Member] | Covenant Based on Sale of First Commercial Product [Member]        
Related Party Transaction, Amounts of Transaction $ 500      
Related Party, Bausch Health [Member] | Royalty [Member]        
Related Party Transaction, Rate 12.00%      
Related Party, Bausch Health [Member] | The Amended Agreement [Member]        
Related Party Transaction, Amounts of Transaction       $ 0