v3.26.1
Note 19 - Related Parties (Details Textual) - USD ($)
1 Months Ended 6 Months Ended 12 Months Ended
Mar. 26, 2026
Dec. 31, 2025
Jun. 02, 2025
Jan. 29, 2025
Jan. 06, 2025
Oct. 28, 2024
Sep. 03, 2024
May 01, 2024
Jan. 09, 2023
Apr. 30, 2025
Jun. 30, 2026
Dec. 31, 2025
Jun. 24, 2026
Jul. 11, 2025
Jun. 20, 2025
Feb. 28, 2025
Aug. 23, 2024
Aug. 22, 2024
Jul. 25, 2024
May 30, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares)     13,154                                  
Class of Warrant or Right, Issued in Period (in shares)                     0                  
Class of Warrant or Right, Exercised in Period (in shares)                     225,564                  
Aircraft Lease [Member] | Minimum [Member]                                        
Lessee, Operating Lease, Remaining Lease Term (Month)                     14 months                  
Aircraft Lease [Member] | Maximum [Member]                                        
Lessee, Operating Lease, Remaining Lease Term (Month)                     22 months                  
Cardionomix Inc. [Member]                                        
Subsidiary, Ownership Percentage, Parent                     82.00%         82.00%        
KardioNav, Inc. [Member]                                        
Subsidiary, Ownership Percentage, Parent   57.00%                   57.00%     57.00%          
KardioNav, Inc. [Member] | Chelak iECG, Inc. [Member]                                        
Subsidiary, Ownership Percentage, Parent                             33.00%          
Series M Warrants [Member]                                        
Class of Warrant or Right, Issued in Period (in shares)   340,000                                    
Warrants and Rights Outstanding   $ 509,000                   $ 509,000                
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)                     $ 1.56                  
Non-plan Options [Member]                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                     175,000                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares)     1,315                                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)   26,315                 201,315 26,315                
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share)   $ 10.07                 $ 2.32 $ 10.07                
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                     $ 1.15                  
Share-Based Payment Arrangement, Option [Member]                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                     200,000                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)   123,678                 307,683 123,678                
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share)   $ 8.07                 $ 3.51 $ 8.07                
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                     $ 1.15                  
Chief Commercial Officer [Member] | Non-plan Options [Member]                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)       13,154       1,315                        
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)       $ 7.98       $ 101.1                        
Chief Commercial Officer [Member] | Share-Based Payment Arrangement, Tranche Two [Member] | Non-plan Options [Member]                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)       1,315                                
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)       4 years                                
Chief Commercial Officer [Member] | Share-Based Payment Arrangement, Tranche One [Member] | Non-plan Options [Member]                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)       1,315                                
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                        
Chief Commercial Officer [Member] | Share-Based Payment Arrangement, Tranche Three [Member] | Non-plan Options [Member]                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)       1,644                                
Chief Financial Officer [Member]                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)         26,315                              
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)         $ 10.07                              
Chief Financial Officer [Member] | Non-plan Options [Member]                                        
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)         $ 10.07                              
Chief Financial Officer [Member] | Share-Based Payment Arrangement, Option [Member]                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)         36 months                              
Chief Financial Officer [Member] | Share-Based Payment Arrangement, Tranche One [Member] | Non-plan Options [Member]                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)         3 years                              
Jenkins and Chief Financial Officer [Member]                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 40,000                                      
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) $ 1.15                                      
Old Catheter [Member] | Mr. Jenkins and Affiliates [Member]                                        
Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares (in shares)                       1,325.838                
Old Catheter [Member] | Mr. Jenkins Adult Children [Member]                                        
Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares (in shares)                       1,284.344                
Conversion of Royalties Payable into Series J Preferred Stock [Member] | Inventor of LockeT [Member]                                        
Conversion of Stock, Shares Issued (in shares)   9,490                                    
LockeT Royalty [Member] | Inventor of LockeT [Member]                                        
Royalty Percentage                   5.00%                    
Royalty Guarantees, Commitments, Amount                   $ 1,000,000                    
LockeT Royalty [Member] | Royalty Payment After U.S. Patent Granted and One Million Paid [Member] | Inventor of LockeT [Member]                                        
Royalty Percentage                 2.00%                      
Royalty Guarantees, Commitments, Amount                   10,000,000                    
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 $ 1,000,000                    
Auston Locke [Member] | LockeT Royalty [Member] | Royalty Payment After U.S. Patent Granted and One Million Paid [Member]                                        
Royalty Percentage                   5.00%                    
Royalty Guarantees, Commitments, Amount                   $ 10,000,000                    
Increase in Royalty Percentage                   2.00%                    
Non-Executive Chief Operating Officer [Member]                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                       757                
Non-Executive Chief Operating Officer [Member] | Share-Based Payment Arrangement, Tranche Two [Member]                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares)                       17                
Non-Executive Chief Operating Officer [Member] | Share-Based Payment Arrangement, Tranche One [Member]                                        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)   740                   740                
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share)   $ 112.1                   $ 112.1                
Related Party [Member] | Related Party Notes [Member]                                        
Debt Instrument, Interest Rate, Stated Percentage                           4.20%     12.00% 8.00%    
Debt Instrument, Face Amount                           $ 150,000            
Related Party [Member] | Related Party Notes [Member] | Series M Warrants [Member]                                        
Class of Warrant or Right, Issued in Period (in shares)   170,000                                    
Related Party [Member] | June 2026 Note [Member]                                        
Debt Instrument, Interest Rate, Stated Percentage                         12.00%              
Debt Instrument, Face Amount                         $ 400,000              
Jenkins Family Charitable Institute [Member]                                        
Debt Instrument, Face Amount                     $ 500,000                  
Proceeds from Issuance Initial Public Offering             $ 500,000                          
Stock Issued During Period, Shares, New Issues (in shares)             13,947                          
Jenkins Family Charitable Institute [Member] | Prefunded Warrants [Member]                                        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)             12,368                          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)             $ 0.0019                          
Class of Warrant or Right, Exercised in Period (in shares)           12,368                            
Stock Issued During Period, Shares, Warrant Exercises (in shares)           12,368                            
Jenkins Family Charitable Institute [Member] | Series H Warrants [Member]                                        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)             26,316                          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)             $ 19                          
Jenkins Family Charitable Institute [Member] | Series I Warrants [Member]                                        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)             26,316                          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)             $ 19                          
Jenkins Family Charitable Institute [Member] | Series J Warrants [Member]                                        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)             26,316                          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)             $ 19                          
Class of Warrant or Right, Distributed (in shares)           23,684                            
Jenkins Family Charitable Institute [Member] | Related Party Notes [Member]                                        
Debt Instrument, Face Amount                                     $ 500,000  
Mr. Jenkins [Member]                                        
Debt Instrument, Face Amount                     $ 500,000                  
Mr. Jenkins [Member] | Cardionomix Inc. [Member]                                        
Subsidiary, Ownership Percentage, Parent                             3.00% 5.00%        
Mr. Jenkins [Member] | Related Party Notes [Member]                                        
Debt Instrument, Face Amount                                       $ 500,000
Mr. Jenkins and Affiliates [Member] | Cardionomix Inc. [Member]                                        
Subsidiary, Ownership Percentage, Parent                             7.00% 7.00%        
Certain Third Parties [Member] | Cardionomix Inc. [Member]                                        
Subsidiary, Ownership Percentage, Parent                               6.00%