Quarterly report [Sections 13 or 15(d)]

Note 4 - Fair Value Measurements (Details Textual)

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Note 4 - Fair Value Measurements (Details Textual)
1 Months Ended 3 Months Ended 9 Months Ended 10 Months Ended
Sep. 22, 2025
USD ($)
shares
Aug. 08, 2025
Aug. 05, 2025
May 31, 2026
Jun. 30, 2026
USD ($)
shares
Jun. 30, 2025
USD ($)
shares
Jun. 30, 2026
USD ($)
shares
Jun. 30, 2025
USD ($)
shares
Jun. 30, 2026
USD ($)
shares
Sep. 30, 2025
shares
Proceeds from Sale of Equity Securities, FV-NI | $             $ 4,971,386 $ 393,217    
Equity Securities, FV-NI, Unrealized Gain (Loss) | $         $ 108,740 $ 0 $ 1,150,399 0    
Reverse Stock Split [Member]                    
Stockholders' Equity Note, Stock Split, Conversion Ratio   10 10              
Reverse Stock Split [Member] | ONCO [Member]                    
Stockholders' Equity Note, Stock Split, Conversion Ratio       10            
ONCO Warrant [Member]                    
Investment Owned, Balance, Shares (in shares) 3,216,344                  
ONCO Warrant [Member] | ONCO [Member]                    
Investment Owned, Balance, Shares (in shares) 87,256       3,216,344   3,216,344   3,216,344  
Series D Preferred Stock [Member] | ONCO [Member]                    
Investment Owned, Balance, Shares (in shares) 16,099                 3,125
ONCO Series D Preferred Stock and ONCO Warrant [Member] | ONCO [Member]                    
Proceeds from Sale of Equity Securities, FV-NI | $ $ 12,900,000                  
ONCO Series D Preferred Stock [Member]                    
Investment Owned, Balance, Shares (in shares) 3,125                  
ONCO Series D Preferred Stock [Member] | Conversion of Series D Preferred Stock into Common Stock [Member]                    
Conversion of Stock, Shares Converted (in shares)         1,196       3,125  
Conversion of Stock, Shares Issued (in shares)                 181,283  
ONCO Series D Preferred Stock [Member] | ONCO [Member] | Calibration Discount Rate [Member]                    
Unobservable input         0   0   0  
ONCO Common Stock [Member] | Conversion of Series D Preferred Stock into Common Stock [Member]                    
Conversion of Stock, Shares Issued (in shares)         104,174          
Common Stock [Member]                    
Equity Securities, FV-NI, Unrealized Gain (Loss) | $               $ (300,000)    
Common Stock [Member] | ONCO [Member]                    
Investment Owned, Balance, Shares (in shares)         104,206 2,854 104,206 2,854 104,206  
Proceeds from Sale of Equity Securities, FV-NI | $         $ 1,800,000   $ 5,000,000 $ 400,000 $ 5,000,000