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Note 8 - Financial Highlights (Details Textual) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2023
 [1]
Jun. 30, 2022
 [1]
Jun. 30, 2023
Jun. 30, 2022
Net Investment Income (Loss) Per Share (in dollars per share) [2] $ (0.00) $ (0.00) $ (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.