Quarterly report [Sections 13 or 15(d)]

Note 4 - Fair Value Measurements (Details Textual)

v3.25.4
Note 4 - Fair Value Measurements (Details Textual) - USD ($)
3 Months Ended
Sep. 22, 2025
Dec. 31, 2025
Dec. 31, 2024
Sep. 30, 2025
Proceeds from Sale of Equity Securities, FV-NI   $ 0 $ 393,217  
Equity Securities, FV-NI, Unrealized Gain (Loss)   $ (120,078) (349,078)  
Series D Preferred Stock [Member] | ONCO [Member]        
Investment Owned, Balance, Shares (in shares) 16,099 3,125   3,125
ONCO Warrant [Member]        
Investment Owned, Balance, Shares (in shares) 846,975      
ONCO Warrant [Member] | ONCO [Member]        
Investment Owned, Balance, Shares (in shares) 4,362,827 846,975   846,975
ONCO Series D Preferred Stock and ONCO Warrant [Member] | ONCO [Member]        
Proceeds from Sale of Equity Securities, FV-NI $ 12,900,000      
Common Stock [Member]        
Equity Securities, FV-NI, Unrealized Gain (Loss)     $ (300,000)  
Common Stock [Member] | ONCO [Member]        
Investment Owned, Balance, Shares (in shares)     142,749  
Proceeds from Sale of Equity Securities, FV-NI     $ 400,000