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Note 8 - Financial Highlights (Details Textual)
 3 Months Ended
Mar. 31, 2022
$ / shares
Net Investment Income (Loss) Per Share (in dollars per share) $ (0.00) [1],[2]
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.