v3.26.1
Note 9 - Related Party Transactions (Details Textual)
 3 Months Ended 9 Months Ended
Jun. 10, 2026
USD ($)
$ / shares
shares
Feb. 12, 2025
USD ($)
$ / shares
shares
Oct. 30, 2024
USD ($)
$ / shares
shares
Jun. 30, 2026
USD ($)
$ / shares
Jun. 30, 2025
USD ($)
$ / shares
Jun. 30, 2026
USD ($)
$ / shares
Jun. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2025
$ / shares
Sep. 30, 2024
$ / shares
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares       $ 15.62 $ 15.35 $ 15.62 $ 15.35 $ 15.35 $ 21.74
Class of Warrant or Right, Issued During Period             326,560    
Chief Executive Officer [Member]                  
Operating Lease, Expense | $       $ 20,000 $ 20,000 $ 59,000 $ 60,000    
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            
Private Placement [Member]                  
Stock Issued During Period, Shares, New Issues (in shares) 729,241                
Shares Issued, Price Per Share (in dollars per share) | $ / shares $ 4.69                
Private Placement [Member] | Chief Executive Officer [Member]                  
Stock Issued During Period, Shares, New Issues (in shares) 153,550                
Shares Issued, Price Per Share (in dollars per share) | $ / shares $ 5.21                
Proceeds from Issuance or Sale of Equity | $ $ 800,000                
February 2025 Series B-1 Purchase Agreement [Member]                  
Proceeds from Issuance or Sale of Equity | $   $ 15,000,000              
February 2025 Series B-1 Purchase Agreement [Member] | Series B-1 Preferred Stock [Member]                  
Stock Issued During Period, Shares, New Issues (in shares)   834              
Shares Issued, Price Per Share (in dollars per share) | $ / shares   $ 10,000              
Preferred Stock, Convertible, Conversion Ratio   5,208              
Preferred Stock, Convertible, Conversion Price | $ / shares   $ 1.92              
February 2025 Series B-1 Purchase Agreement [Member] | Common Stock [Member]                  
Stock Issued During Period, Shares, New Issues (in shares)   3,468,746              
Shares Issued, Price Per Share (in dollars 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 (in shares)   100              
Proceeds from Issuance or Sale of Equity | $   $ 1,000,000              
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 (in shares)   834              
Shares Issued, Price Per Share (in dollars per share) | $ / shares   $ 10,000              
Preferred Stock, Convertible, Conversion Ratio   5,208              
Preferred Stock, Convertible, Conversion Price | $ / shares   $ 1.92              
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 (in shares)   3,468,746              
Shares Issued, Price Per Share (in dollars per share) | $ / shares   $ 1.92              
February 2025 Series B-1 Purchase Agreement [Member] | Patrick Marshall [Member] | Common Stock [Member]                  
Stock Issued During Period, Shares, New Issues (in shares)   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 (in shares)   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 (in shares)   734              
February 2025 Series B-1 Purchase Agreement [Member] | Beneficial Owner [Member] | Common Stock [Member]                  
Stock Issued During Period, Shares, New Issues (in shares)   2,687,500              
October 2024 SPA [Member] | Chief Executive Officer, Secretary, and Director [Member]                  
Proceeds from Issuance or Sale of Equity | $     $ 1,540,819            
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 (in shares)     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