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Note 2 - Significant Accounting Policies (Details Textual) - USD ($)
Jun. 30, 2025
Dec. 31, 2024
Deposits with Clearing Organizations and Others, Securities [1] $ 43,045,922 $ 36,229,375
[1] Cost of short-term investments held at the broker (restricted): $43,045,459 and $36,223,466, respectively.