Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Fair Value Measurements (Details Textual)

v3.25.0.1
Note 4 - Fair Value Measurements (Details Textual)
3 Months Ended
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
Oct. 03, 2024
yr
shares
Sep. 30, 2024
USD ($)
Sep. 24, 2024
shares
Oct. 03, 2023
USD ($)
Proceeds from Sale of Equity Securities, FV-NI $ 393,217 $ 0        
Equity Securities, FV-NI, Unrealized Gain (Loss) $ (349,078) (379,898)        
Fair Value, Inputs, Level 3 [Member] | Preferred Stock [Member] | Measurement Input, Discount Rate [Member] | ONCO [Member]            
Equity Securities, FV-NI, Measurement Input     0.35      
ONCO [Member] | Fair Value, Inputs, Level 3 [Member] | Preferred Stock [Member] | Measurement Input, Price Volatility [Member]            
Equity Securities, FV-NI, Measurement Input     0.79      
ONCO [Member] | Fair Value, Inputs, Level 3 [Member] | Preferred Stock [Member] | Measurement Input, Expected Term [Member]            
Equity Securities, FV-NI, Measurement Input | yr     3      
ONCO [Member] | Fair Value, Inputs, Level 3 [Member] | Preferred Stock [Member] | Measurement Input, Discount for Lack of Marketability [Member]            
Equity Securities, FV-NI, Measurement Input     0.15      
ONCO [Member] | Fair Value, Inputs, Level 3 [Member] | Preferred Stock [Member] | Measurement Input, Probability Of Dissolution [Member[            
Equity Securities, FV-NI, Measurement Input     0.60      
Common Stock [Member] | ONCO [Member]            
Investment Owned, Balance, Shares (in shares) | shares 142,749       142,749  
Proceeds from Sale of Equity Securities, FV-NI $ 400,000          
Investment Owned, Balance, Principal Amount       $ 700,000    
Equity Securities, FV-NI, Unrealized Gain (Loss) $ (300,000) $ (400,000)        
Series A Convertible Preferred Stock [Member] | ONCO [Member]            
Investment Owned, Balance, Shares (in shares) | shares     3,000      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value           $ 900,000