Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ / shares in Thousands	Jun. 30, 2026	Dec. 31, 2025
Investment Owned, Fair Value	$ 148,635	$ 225,436
Deferred Compensation Arrangement, Net Asset Value to Trigger Notational Cash Contingency (in dollars per share)	$ 0
Deferred Compensation Arrangement, Percent of Compensation Deferred	50.00%
Venture Capital Funds [Member]
Investment Owned, Fair Value	$ 0.1
Restricted Securities [Member]
Investment Owned, Fair Value	$ 144,732	$ 169,165

Fair value of investment in security owned.

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+ Details