v3.26.1
Note 13 - Preferred Stock (Details Textual)
 1 Months Ended 2 Months Ended 3 Months Ended
May 12, 2025
USD ($)
$ / shares
shares
Jan. 09, 2023
USD ($)
$ / shares
shares
Mar. 31, 2026
USD ($)
$ / shares
shares
Feb. 28, 2026
shares
Mar. 31, 2026
USD ($)
$ / shares
shares
Mar. 31, 2026
USD ($)
$ / shares
shares
Feb. 06, 2026
Feb. 05, 2026
Dec. 31, 2025
USD ($)
$ / shares
shares
Oct. 17, 2025
shares
Jan. 13, 2025
shares
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares     $ 0.0001   $ 0.0001 $ 0.0001     $ 0.0001    
Preferred Stock, Shares Authorized (in shares)     10,000,000   10,000,000 10,000,000     10,000,000 10,000,000 10,000,000
Series X Preferred Stock [Member]                      
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)   5.26                  
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares   $ 608                  
Preferred Stock, Shares Issued (in shares)     0   0 0     0    
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares     $ 0.0001   $ 0.0001 $ 0.0001     $ 0.0001    
Preferred Stock, Value, Issued | $     $ 0   $ 0 $ 0     $ 0    
Preferred Stock, Shares Outstanding (in shares)     0   0 0     0    
Preferred Stock, Shares Authorized (in shares)     15,404   15,404 15,404     15,404    
Series B Convertible Preferred Stock [Member]                      
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares $ 6.65   $ 1.78   $ 1.78 $ 1.78          
Preferred Stock, Shares Issued (in shares) 3,000                    
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares $ 0.0001                    
Preferred Stock, Value, Issued | $ $ 1,000                    
Preferred Stock, Convertible, Shares Issuable (in shares) 451,126                    
Preferred Stock, Convertible, Number of Common Shares Issuable Per One-thousand Dollar of Stated Value (in shares) 150.38                    
Preferred Stock, Convertible, Maximum Allowed Amount of Common Shares (in shares) 115,913                    
Preferred Stock, Convertible, Conversion Ratio 19.99                    
Percentage of Common Stock Outstanding, Threshold for Conversion 4.99%                    
Conversion of Stock, Maximum Threshold Percentage Allowing Conversion 9.99%                    
Maximum Beneficial Ownership             9.99% 4.99%      
Deemed Dividend, Preferred Stock | $           $ 1,400,000          
Preferred Stock, Shares Outstanding (in shares)     1,632   1,632 1,632     2,229    
Series C1 Convertible Preferred Stock [Member]                      
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares     $ 1.43   $ 1.43 $ 1.43          
Preferred Stock, Shares Issued (in shares)     3,470   3,470 3,470     0    
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares     $ 0.0001   $ 0.0001 $ 0.0001     $ 0.0001    
Preferred Stock, Value, Issued | $     $ 0   $ 0 $ 0     $ 0    
Percentage of Common Stock Outstanding, Threshold for Conversion         4.99%            
Conversion of Stock, Maximum Threshold Percentage Allowing Conversion         9.99%            
Preferred Stock, Shares Outstanding (in shares)     3,470   3,470 3,470     0    
Stock Issued During Period, Shares, New Issues (in shares)     1,853 1,617              
Preferred Stock, Stated Value | $     $ 1,000   $ 1,000 $ 1,000          
Preferred Stock, Shares Authorized (in shares)     3,687   3,687 3,687     3,687    
Series C1 Convertible Preferred Stock [Member] | Minimum [Member]                      
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares     $ 0.35   $ 0.35 $ 0.35          
Series J Preferred Stock [Member]                      
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares     $ 1.56   $ 1.56 $ 1.56          
Preferred Stock, Shares Issued (in shares)     9,490   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     $ 0.0001    
Preferred Stock, Value, Issued | $     $ 0   $ 0 $ 0     $ 0    
Preferred Stock, Convertible, Shares Issuable (in shares)     6,083,005   6,083,005 6,083,005          
Preferred Stock, Convertible, Conversion Ratio     641.03   641.03 641.03          
Maximum Beneficial Ownership     4.99%   4.99% 4.99%          
Preferred Stock, Shares Outstanding (in shares)     9,490   9,490 9,490     9,490    
Preferred Stock, Stated Value | $                 $ 1,000    
Preferred Stock, Shares Authorized (in shares)     9,490   9,490 9,490     9,490    
Preferred Stock Fair Value, Additional Paid-in Capital | $     $ 5,300,000   $ 5,300,000 $ 5,300,000     $ 5,300,000    
Maximum Beneficial Ownership, With Notice     9.99%   9.99% 9.99%          
Old Catheter [Member] | Series X Preferred Stock [Member]                      
Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares (in shares)   14,649.592                  
Old Catheter [Member] | Conversion of Convertible Promissory Notes into Series X Preferred Stock [Member]                      
Debt Conversion, Original Debt, Amount | $   $ 25,200,000