Note 3 - Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Money Market Funds	$ 120,047,840	$ 188,640,417	$ 32,968,833
Demand Deposit Savings Accounts	29,148,056	46,061,819	99,262,744
Commercial Paper	143,041,466	199,360,060	119,980,366
Total cash and cash equivalents as presented on the combined Statement of Assets and Liabilities	$ 292,237,362	$ 434,062,296	$ 252,211,943