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Note 10 - Related Party Transactions (Details Textual)
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 12, 2025
USD ($)
$ / shares
shares
Oct. 30, 2024
USD ($)
$ / shares
shares
Oct. 31, 2023
USD ($)
Mar. 31, 2025
USD ($)
$ / shares
Dec. 31, 2024
USD ($)
Mar. 31, 2024
USD ($)
$ / shares
Dec. 31, 2023
USD ($)
Mar. 31, 2025
USD ($)
$ / shares
shares
Mar. 31, 2024
USD ($)
$ / shares
Sep. 30, 2024
$ / shares
Sep. 30, 2023
$ / shares
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares       $ 15.35   $ 21.76   $ 15.35 $ 21.76 $ 21.74 $ 19.51
Class of Warrant or Right, Issued During Period               326,560      
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]     Base Rate [Member]                
Revolving Credit Facility [Member] | Pardeep Nijhawan Medicine Professional Corporation [Member]                      
Line of Credit Facility, Maximum Borrowing Capacity | $     $ 10,000,000                
Debt Instrument, Basis Spread on Variable Rate     3.00%                
Debt Instrument, Covenant, Maximum Percentage of Borrowing Base for Outstanding Principal     85.00%                
Line of Credit Facility, Commitment Fee Amount | $       $ 0   $ 4,000   $ 13,000 $ 25,000    
Unsecured Line of Credit [Member] | Pardeep Nijhawan Medicine Professional Corporation [Member]                      
Line of Credit Facility, Maximum Borrowing Capacity | $     $ 3,500,000                
Chief Executive Officer [Member]                      
Operating Lease, Expense | $       $ 0 $ 18,000 $ 20,000 $ 40,000        
Chief Executive Officer, Secretary, and Director [Member] | Warrant Shares [Member]                      
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares   $ 3.445                  
Class of Warrant or Right, Issued During Period   326,560                  
February 2025 Series B-1 Purchase Agreement [Member]                      
Proceeds from Issuance or Sale of Equity | $ $ 15,000,000             15,000,000      
February 2025 Series B-1 Purchase Agreement [Member] | Series B-1 Preferred Stock [Member]                      
Stock Issued During Period, Shares, New Issues 834                    
Preferred Stock, Convertible, Conversion Ratio 5,208                    
Preferred Stock, Convertible, Conversion Price | $ / shares $ 1.92                    
Shares Issued, Price Per Share | $ / shares $ 10,000                    
February 2025 Series B-1 Purchase Agreement [Member] | Common Stock [Member]                      
Stock Issued During Period, Shares, New Issues 3,468,746                    
Shares Issued, Price Per Share | $ / shares $ 1.92                    
February 2025 Series B-1 Purchase Agreement [Member] | CEO, Secretary, Directors, Velan, Stonepine, Nantahala, and Rubric [Member] | Series B-1 Preferred Stock [Member]                      
Stock Issued During Period, Shares, New Issues 834                    
Preferred Stock, Convertible, Conversion Ratio 5,208                    
Preferred Stock, Convertible, Conversion Price | $ / shares $ 1.92                    
Shares Issued, Price Per Share | $ / shares $ 10,000                    
Preferred Stock, Convertible, Maximum Beneficial Ownership 4.99%                    
Preferred Stock, Convertible, Maximum Beneficial Ownership at Option of Holder 9.99%                    
Preferred Stock, Convertible, Maximum Beneficial Ownership at Option of Holder Given 61 Days Notice 19.99%                    
February 2025 Series B-1 Purchase Agreement [Member] | CEO, Secretary, Directors, Velan, Stonepine, Nantahala, and Rubric [Member] | Common Stock [Member]                      
Stock Issued During Period, Shares, New Issues 3,468,746                    
Shares Issued, Price Per Share | $ / shares $ 1.92                    
February 2025 Series B-1 Purchase Agreement [Member] | Chief Executive Officer [Member] | Series B-1 Preferred Stock [Member]                      
Stock Issued During Period, Shares, New Issues 100                    
Proceeds from Issuance or Sale of Equity | $ $ 1,000,000                    
February 2025 Series B-1 Purchase Agreement [Member] | Patrick Marshall [Member] | Common Stock [Member]                      
Stock Issued During Period, Shares, New Issues 41,666                    
Proceeds from Issuance or Sale of Equity | $ $ 80,000                    
February 2025 Series B-1 Purchase Agreement [Member] | Carlo Sistilli [Member] | Common Stock [Member]                      
Stock Issued During Period, Shares, New Issues 10,416                    
Proceeds from Issuance or Sale of Equity | $ $ 20,000                    
February 2025 Series B-1 Purchase Agreement [Member] | Beneficial Owner [Member]                      
Proceeds from Issuance or Sale of Equity | $ $ 12,500,000                    
February 2025 Series B-1 Purchase Agreement [Member] | Beneficial Owner [Member] | Series B-1 Preferred Stock [Member]                      
Stock Issued During Period, Shares, New Issues 734                    
February 2025 Series B-1 Purchase Agreement [Member] | Beneficial Owner [Member] | Common Stock [Member]                      
Stock Issued During Period, Shares, New Issues 2,687,500                    
October 2024 SPA [Member] | Chief Executive Officer, Secretary, and Director [Member]                      
Proceeds from Issuance or Sale of Equity | $   $ 1,540,819           $ 1,500,000      
Equity Offering, Maximum Amount | $   $ 5,000,000                  
October 2024 SPA [Member] | Chief Executive Officer, Secretary, and Director [Member] | Series A-1 Preferred Stock [Member]                      
Stock Issued During Period, Shares, New Issues   150                  
Preferred Stock, Convertible, Conversion Ratio   2,903                  
Preferred Stock, Convertible, Conversion Price | $ / shares   $ 3.445                  
Preferred Stock, Convertible, Maximum Beneficial Ownership   19.99%                  
Equity Offering, Maximum Amount | $   $ 5,000,000                  
Preferred Stock, Convertible, Shares Issuable   435,414