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Note 3 - Investment Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Amortized cost, as adjusted	$ 129,678	$ 120,363
Gross unrealized holding gains	7	331
Gross unrealized holding losses	(371)	0
Estimated fair value	129,314	120,694
US Government Agencies Debt Securities [Member] | Short-Term Investments [Member]
Amortized cost, as adjusted	69,673	62,822
Gross unrealized holding gains	5	130
Gross unrealized holding losses	(53)	0
Estimated fair value	69,625	62,952
US Government Agencies Debt Securities [Member] | Long Term Investments [Member]
Amortized cost, as adjusted	60,005	57,541
Gross unrealized holding gains	2	201
Gross unrealized holding losses	(318)	0
Estimated fair value	$ 59,689	$ 57,742

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