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Note 19 - Related Parties (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2024
Oct. 25, 2024
Oct. 24, 2024
Sep. 03, 2024
Aug. 28, 2024
May 01, 2024
Oct. 24, 2023
Mar. 23, 2023
Mar. 21, 2023
Jan. 09, 2023
Dec. 31, 2024
Aug. 23, 2024
Aug. 22, 2024
Jul. 31, 2024
Jun. 30, 2023
Jan. 10, 2023
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)                            
Class of Warrant or Right, Exercised in Period (in shares)                     6,209,979          
Series H Warrants [Member]                                
Class of Warrant or Right, Exercised in Period (in shares)   1,990,000 1,990,000                          
Series I Warrants [Member]                                
Class of Warrant or Right, Exercised in Period (in shares)   2,325,000 2,325,000                          
Related Party Notes [Member]                                
Debt Instrument, Interest Rate, Stated Percentage                       12.00%   8.00%    
Non-plan Options [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                     25,000          
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                     $ 5.32          
Chief Commercial Officer [Member] | Non-plan Options [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)           25,000                    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)           $ 5.321                    
Chief Commercial Officer [Member] | Share-Based Payment Arrangement, Tranche One [Member] | Non-plan Options [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage           20.00%                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)           5 years                    
Old Catheter [Member]                                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets $ 1,400,000                   $ 1,400,000       $ 23,000  
Old Catheter [Member] | Mr. Jenkins and Affiliates [Member]                                
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)                     1,325.838          
Old Catheter [Member] | Mr. Jenkins Adult Children [Member]                                
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)                     1,284.344          
Old Catheter [Member] | Mr. Jenkins [Member]                                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets                               $ 1,100,000
Conversion of Series X Convertible Preferred Stock into Common Stock [Member]                                
Conversion of Stock, Shares Issued (in shares)             1,868 197,491 199,359              
Conversion of Stock, Shares Converted (in shares)             18.676 1,974.905 1,993.581              
Conversion of Series X Convertible Preferred Stock into Common Stock [Member] | Mr. Jenkins and Affiliates [Member]                                
Conversion of Stock, Shares Issued (in shares)                 99,182              
Conversion of Stock, Shares Converted (in shares)                 991,828              
Conversion of Series X Convertible Preferred Stock into Common Stock [Member] | Mr. Jenkins Adult Children [Member]                                
Conversion of Stock, Shares Issued (in shares)                 23,532              
Conversion of Stock, Shares Converted (in shares)                 235,320              
David Jenkins [Member]                                
Convertible Notes Payable                   $ 25,100,000            
Interest Accrued and Unpaid, Forgiven Amount                   $ 13,900,000            
David Jenkins [Member] | LockeT Royalty [Member]                                
Royalty Percentage                   12.00%            
David Jenkins [Member] | Conversion of Convertible Promissory Notes into Series X Preferred Stock [Member]                                
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)                   7,856.251            
Auston Locke [Member] | LockeT Royalty [Member]                                
Royalty Percentage                   5.00%            
Royalty Guarantees, Commitments, Amount                   $ 1,000,000            
Auston Locke [Member] | LockeT Royalty [Member] | Royalty Payment After U.S. Patent Granted and One Million Paid [Member]                                
Royalty Percentage                   2.00%            
Royalty Guarantees, Commitments, Amount                   $ 10,000,000            
Non-Executive Chief Operating Officer [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                   14,416            
Non-Executive Chief Operating Officer [Member] | Share-Based Payment Arrangement, Tranche One [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                   14,081            
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                   $ 5.9            
Non-Executive Chief Operating Officer [Member] | Share-Based Payment Arrangement, Tranche Two [Member]                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                   335            
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                   $ 20.2            
Related Party [Member] | Related Party Notes [Member]                                
Debt Instrument, Interest Rate, Stated Percentage                       12.00% 8.00%      
Jenkins Family Charitable Institute [Member]                                
Proceeds from Issuance Initial Public Offering       $ 500,000                        
Stock Issued During Period, Shares, New Issues (in shares)       265,000                        
Jenkins Family Charitable Institute [Member] | Prefunded Warrants [Member]                                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)       235,000                        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)       $ 0.0001                        
Class of Warrant or Right, Exercised in Period (in shares)         235,000                      
Stock Issued During Period, Shares, Warrant Exercises (in shares)         235,000                      
Jenkins Family Charitable Institute [Member] | Series H Warrants [Member]                                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)       500,000                        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)       $ 1                        
Jenkins Family Charitable Institute [Member] | Series I Warrants [Member]                                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)       500,000                        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)       $ 1                        
Jenkins Family Charitable Institute [Member] | Series J Warrants [Member]                                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)       500,000                        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)       $ 1                        
Class of Warrant or Right, Distributed (in shares) 450,000