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Note 8 - Financial Highlights (Details Textual) - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2024
 [1]
Sep. 30, 2023
 [1]
Sep. 30, 2024
Sep. 30, 2023
Net Investment Income (Loss) Per Share (in dollars per share) [2] $ (0) $ (0) $ (0.01) $ (0.01)
Minimum [Member]        
Net Investment Income (Loss) Per Share (in dollars per share)     $ (0.005)  
[1] Amount is greater than $(0.005).
[2] Based on average Shares outstanding during the period.