Note 3 - Investment Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Amortized cost, as adjusted		$ 71,778
Gross unrealized holding gains		0
Gross unrealized holding losses		1,482
Estimated fair value		70,296
US Government Agencies Debt Securities [Member]
Amortized cost, as adjusted	$ 124,575
Gross unrealized holding gains	30
Gross unrealized holding losses	53
Estimated fair value	124,552
US Government Agencies Debt Securities [Member] \| Short-Term Investments [Member]
Amortized cost, as adjusted	124,575	59,374
Gross unrealized holding gains	30	0
Gross unrealized holding losses	53	1,053
Estimated fair value	$ 124,552	58,321
US Government Agencies Debt Securities [Member] \| Long Term Investments [Member]
Amortized cost, as adjusted		12,404
Gross unrealized holding losses		429
Estimated fair value		$ 11,975

Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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