Note 6 - Equity Securities (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Equity Securities, FV-NI, Cost	$ 116,907		$ 116,907		$ 51,886
Equity Securities, FV-NI	27,246		27,246		$ 32,754
Equity Securities, FV-NI, Unrealized Gain (Loss)	$ 36,100	$ 3,300	65,021	$ (2,318)
Equity Securities, FV-NI, Unrealized Gain			$ 67,300