Quarterly report [Sections 13 or 15(d)]

Note 9 - Stockholders' Equity (Details Textual)

v3.26.1
Note 9 - Stockholders' Equity (Details Textual)
 3 Months Ended 6 Months Ended 35 Months Ended
Oct. 31, 2025
USD ($)
$ / shares
shares
Aug. 08, 2025
Aug. 05, 2025
May 02, 2024
USD ($)
shares
Dec. 13, 2023
USD ($)
May 02, 2023
USD ($)
Dec. 31, 2025
USD ($)
Mar. 31, 2025
USD ($)
Mar. 31, 2026
USD ($)
$ / shares
shares
Mar. 31, 2025
USD ($)
Mar. 31, 2026
USD ($)
$ / shares
shares
Sep. 30, 2025
USD ($)
shares
Mar. 31, 2023
USD ($)
Preferred Stock, Shares Issued (in shares)                 0   0 0  
Preferred Stock, Shares Outstanding (in shares)                 0   0 0  
Security Offering, Maximum Value of Securities, Shelf Registration | $                 $ 200,000,000   $ 200,000,000   $ 200,000,000
Security Offering, Remaining Value of Securities, Shelf Registration | $                 33,300,000   $ 33,300,000    
Stock Issued During Period, Value, Issued for Services | $               $ 98,020          
The 2025 Pre-funded Warrants [Member]                          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 7,000,000                        
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) 1                        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares $ 0.001                        
Warrants and Rights Outstanding | $ $ 8,400,000                        
Series A Warrants [Member]                          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 8,400,000                        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares $ 3                        
Class of Warrant or Right, Combined Public Offering Price (in dollars per share) | $ / shares $ 3                        
Warrants and Rights Outstanding | $ $ 8,500,000                        
Series B Warrants [Member]                          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 8,400,000                        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares $ 3                        
Class of Warrant or Right, Combined Public Offering Price (in dollars per share) | $ / shares $ 3                        
Warrants and Rights Outstanding | $ $ 6,700,000                        
Public Offering [Member]                          
Stock Issued During Period, Shares, New Issues (in shares) 1,400,000                        
Proceeds from Issuance or Sale of Equity | $ $ 23,400,000               23,366,345 $ 0      
Discounts and Commissions for Stock Issuance Costs | $ 1,500,000                        
Stock Issuance Costs Payable | $ 300,000                        
Stock Issued During Period, Value, New Issues | $ $ 1,700,000           $ 23,366,345            
Lincoln Park Purchase Agreement [Member]                          
Stock Issued During Period, Shares, New Issues (in shares)                     302,500    
Stock Issued During Period, Value, New Issues | $                     $ 3,100,000    
Shares Purchase Agreement, Value, Shares Authorized | $         $ 50,000,000 $ 100,000,000              
Share Purchase Agreement, Term (Month)           36 months              
Stock Issued During Period, Shares, Issued for Services (in shares)       80,000                  
Stock Issued During Period, Value, Issued for Services | $       $ 1,000,000                  
Deferred Offering Costs | $       57,000                  
Deferred Costs | $       $ 1,100,000                  
Unamortized Debt Issuance Expense | $                 $ 870,000,000,000   $ 870,000,000,000 $ 870,000,000,000  
Lincoln Park Purchase Agreement [Member] | Maximum [Member]                          
Shares Purchase Agreement, Value, Shares Authorized | $         50,000,000 $ 100,000,000              
Lincoln Park Purchase Agreement [Member] | Minimum [Member]                          
Shares Purchase Agreement, Value, Shares Authorized | $         $ 50,000,000                
Reverse Stock Split [Member]                          
Stockholders' Equity Note, Stock Split, Conversion Ratio   10 10                    
Preferred Class A [Member]                          
Preferred Stock, Shares Authorized (in shares)                 5,000,000   5,000,000    
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares                 $ 0.01   $ 0.01    
Preferred Stock, Shares Issued (in shares)                 0   0 0  
Preferred Stock, Shares Outstanding (in shares)                 0   0 0  
Preferred Class, Series A-1 [Member]                          
Preferred Stock, Shares Authorized (in shares)                 1,040,000   1,040,000    
Preferred Class, Series A-2 [Member]                          
Preferred Stock, Shares Authorized (in shares)                 1,500,000   1,500,000    
Preferred Class, Series A-3 [Member]                          
Preferred Stock, Shares Authorized (in shares)                 700,000   700,000    
Preferred Class, Series A-4 [Member]                          
Preferred Stock, Shares Authorized (in shares)                 548,000   548,000    
Series B Preferred Stock [Member]                          
Preferred Stock, Shares Authorized (in shares)                 15,000   15,000    
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares                 $ 0.5   $ 0.5    
Preferred Stock, Shares Issued (in shares)                 0   0 0  
Preferred Stock, Shares Outstanding (in shares)                 0   0 0