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Note 4 - Investment Management Fee (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2024
Sep. 30, 2023
Sep. 30, 2025
Sep. 30, 2025
Dec. 31, 2024
Management Fee Payable     $ 0 $ 0 $ 127,478
Management [Member]          
Management and Service Fees, Rate       2.00%  
Management and Service Fees, Incentive Rate       20.00%  
Increase (Decrease) in Incentive Fee Payable     $ 0    
Management Fee Payable $ 3,000,000 $ 2,500,000      
Investment Company, Contractual Fee Waived $ 3,000,000 $ 2,500,000