v3.26.1
Note 1 - Organization and Nature of Operations (Details Textual)
 1 Months Ended 12 Months Ended
Mar. 09, 2026
USD ($)
$ / shares
shares
Feb. 06, 2026
USD ($)
$ / shares
shares
Dec. 31, 2025
USD ($)
$ / shares
shares
Dec. 26, 2025
USD ($)
Aug. 15, 2025
$ / shares
May 22, 2025
May 12, 2025
USD ($)
$ / shares
shares
Mar. 31, 2026
USD ($)
$ / shares
shares
Feb. 28, 2026
USD ($)
$ / shares
shares
Dec. 31, 2025
USD ($)
$ / shares
shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Oct. 17, 2025
shares
Jul. 11, 2025
USD ($)
Jun. 20, 2025
Feb. 28, 2025
Jan. 13, 2025
shares
Aug. 23, 2024
Aug. 22, 2024
Stock, Shares Authorized (in shares) | shares                       510,000,000       70,000,000    
Common Stock, Shares Authorized (in shares) | shares     500,000,000             500,000,000 500,000,000 500,000,000       60,000,000    
Preferred Stock, Shares Authorized (in shares) | shares     10,000,000             10,000,000 10,000,000 10,000,000       10,000,000    
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares     $ 0.0001   $ 0.0001         $ 0.0001 $ 0.0001              
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest                   $ (17,695,000) $ (16,643,000)              
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation                   (8,296,000) (9,271,000)              
Retained Earnings (Accumulated Deficit)     $ (309,535,000)             (309,535,000) (292,352,000)              
Working Capital (Deficit)     (3,500,000)             (3,500,000)                
Cash and Cash Equivalent     $ 88,000             $ 88,000 $ 2,873,000              
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares     $ 0.0001             $ 0.0001 $ 0.0001              
Debt Instrument, Unamortized Discount     $ 209,000             $ 209,000                
Class of Warrant or Right, Issued in Period (in shares) | shares                   579,098                
Conversion of Royalties Payable into Series J Preferred Stock [Member]                                    
Debt Conversion, Original Debt, Amount     $ 2,700,000                              
Debt Conversion, Converted Instrument, Shares Issued (in shares) | shares     9,490                              
Boot Capital First Convertible Note Payable [Member]                                    
Debt Instrument, Face Amount       $ 102,000                            
Debt Instrument, Unamortized Discount       2,000                            
Proceeds from Issuance of Debt       100,000                            
Boot Capital Second Convertible Note Payable [Member]                                    
Debt Instrument, Face Amount       204,000                            
Debt Instrument, Unamortized Discount       4,000                            
Proceeds from Issuance of Debt       $ 200,000                            
Boot Capital Convertible Notes Payable [Member]                                    
Debt Instrument, Interest Rate, Stated Percentage       10.00%                            
Debt Instrument, Default Interest Rate       22.00%                            
Related Party Notes [Member] | Related Party [Member]                                    
Debt Instrument, Face Amount                         $ 150,000          
Debt Instrument, Interest Rate, Stated Percentage                         4.20%       12.00% 8.00%
Series L Warrants [Member]                                    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares     $ 9.5             $ 9.5                
Series M Warrants [Member]                                    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares     $ 1.56             $ 1.56                
Class of Warrant or Right, Issued in Period (in shares) | shares     340,000                              
Series M Warrants [Member] | Related Party Notes [Member] | Related Party [Member]                                    
Class of Warrant or Right, Issued in Period (in shares) | shares     170,000                              
Series B Preferred Stock [Member]                                    
Preferred Stock, Shares Authorized (in shares) | shares     3,000             3,000 3,000              
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares     $ 0.0001             $ 0.0001 $ 0.0001              
Series B Preferred Stock [Member] | Subsequent Event [Member]                                    
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares   $ 1.78             $ 1.78                  
Proceeds from Decrease of Preferred Stock Conversion Price   $ 400,000             $ 400,000                  
Series J Preferred Stock [Member]                                    
Preferred Stock, Shares Authorized (in shares) | shares     9,490             9,490 9,490              
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares     $ 0.0001             $ 0.0001 $ 0.0001              
Preferred Stock, Stated Value     $ 1,000             $ 1,000                
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares     $ 1.56             $ 1.56                
May 2025 PIPE Financing [Member]                                    
Proceeds from Issuance or Sale of Equity             $ 1,500,000                      
Offering Fees             400,000                      
Stock Issued During Period, Value, New Issues                   $ 2,034,000                
Payments of Stock Issuance Costs             $ 400,000                      
May 2025 PIPE Financing [Member] | Series L Warrants [Member]                                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares             150                      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares             $ 9.5                      
May 2025 PIPE Financing [Member] | PIPE Units [Member]                                    
Stock Issued During Period, Shares, New Issues (in shares) | shares             1,500                      
Units Issued, Series B Preferred Shares Per Unit             1                      
May 2025 PIPE Financing [Member] | Series B Preferred Stock [Member]                                    
Stock Issued During Period, Shares, New Issues (in shares) | shares             1,500                      
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares             $ 0.0001                      
ATM Agreement [Member]                                    
Stock Issued During Period, Shares, New Issues (in shares) | shares                   887,852                
Stock Issued During Period, Value, New Issues                   $ 4,000,000                
Payments of Stock Issuance Costs                   $ 300,000                
Private Placement [Member] | Subsequent Event [Member]                                    
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares   $ 0.0001             $ 0.0001                  
Stock Issued During Period, Shares, New Issues (in shares) | shares   392,608             392,608                  
Proceeds from Issuance or Sale of Equity   $ 2,200,000             $ 2,200,000                  
Shares Issued, Price Per Share (in dollars per share) | $ / shares   $ 1.43             $ 1.43                  
Proceeds from Issuance of Convertible Preferred Stock   $ 1,600,000           $ 1,900,000                    
Equity Issuable, Maximum Shares Ownable, Percent of Outstanding 19.99% 19.99%                                
Private Placement [Member] | Series C1 Convertible Preferred Stock [Member] | Subsequent Event [Member]                                    
Stock Issued During Period, Shares, New Issues (in shares) | shares 1,853 1,616.33           1,853 1,616.33                  
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares $ 0.0001 $ 0.0001           $ 0.0001 $ 0.0001                  
Preferred Stock, Stated Value $ 1,000 $ 1,000           $ 1,000 $ 1,000                  
Proceeds from Issuance of Convertible Preferred Stock $ 1,900,000             $ 1,900,000                    
Private Placement [Member] | Series C3 Convertible Preferred Stock [Member] | Subsequent Event [Member]                                    
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares               $ 0.0001 $ 0.0001                  
Preferred Stock, Stated Value                 $ 1,000                  
Private Placement [Member] | Series C2 Convertible Preferred Stock [Member] | Subsequent Event [Member]                                    
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares $ 0.0001 $ 0.0001                                
Preferred Stock, Stated Value $ 1,000 $ 1,000                                
Private Placement [Member] | Series C4 Convertible Preferred Stock [Member] | Subsequent Event [Member]                                    
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares $ 0.0001 $ 0.0001           $ 0.0001 $ 0.0001                  
Preferred Stock, Stated Value $ 1,000 $ 1,000           $ 1,000 $ 1,000                  
Maximum Value of Shares Issuable 35,600,000 $ 39,200,000           $ 35,600,000 $ 39,200,000                  
Private Placement [Member] | Series C2 and C3 Convertible Preferred Stock [Member] | Subsequent Event [Member]                                    
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares               $ 0.0001 $ 0.0001                  
Preferred Stock, Stated Value               $ 1,000 $ 1,000                  
Proceeds from Issuance of Convertible Preferred Stock $ 1,900,000               $ 1,600,000                  
Cardionomic's Late-stage Treatment for Acute Decompensated Heart Failure [Member]                                    
Debt Instrument, Term (Year)           3 years                        
Reverse Stock Split [Member]                                    
Stockholders' Equity Note, Stock Split, Conversion Ratio         19         19                
Cardionomix Inc. [Member]                                    
Subsidiary, Ownership Percentage, Parent     82.00%             82.00%         82.00%      
Cardionomix Inc. [Member] | Chief Executive Officer and Chairman of the Board [Member]                                    
Subsidiary, Ownership Percentage, Parent     12.00%             12.00%                
Cardionomix Inc. [Member] | Certain Third Parties [Member]                                    
Subsidiary, Ownership Percentage, Parent     6.00%             6.00%                
KardioNav, Inc. [Member]                                    
Subsidiary, Ownership Percentage, Parent     57.00%             57.00%       57.00%        
KardioNav, Inc. [Member] | Chief Executive Officer and Chairman of the Board [Member]                                    
Subsidiary, Ownership Percentage, Parent     10.00%             10.00%                
KardioNav, Inc. [Member] | Certain Third Parties [Member]                                    
Subsidiary, Ownership Percentage, Parent     33.00%             33.00%                
KardioNav, Inc. [Member] | Chelak iECG, Inc. [Member]                                    
Subsidiary, Ownership Percentage, Parent     33.00%             33.00%