Note 7 - Fair Value of Financial Assets and Liabilities - Assets and Liabilities at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Securities owned	$ 4,500	$ 9,756
Marketable securities	2,394	46,516
Fair Value, Inputs, Level 1 [Member]
Securities owned	72	0
Marketable securities	1,099	45,049
Fair Value, Inputs, Level 2 [Member]
Securities owned	4,428	8,014
Marketable securities	1,295	1,467
Fair Value, Inputs, Level 3 [Member]
Securities owned	0	1,742
Marketable securities	$ 0	$ 0

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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+ Details