Note 4 - Repurchase Agreements and Reverse Purchase Agreements (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Restricted Cash and Cash Equivalent, Current	$ 86,114	$ 58,696
Repurchase Agreement Counterparty, Amount at Risk	499,900
Securities for Reverse Repurchase Agreements	358,740	128,613
Securities Borrowed Under Reverse Repurchase Agreements	359,202	128,724
Asset Pledged as Collateral [Member]
Restricted Cash and Cash Equivalent, Current	86,114	58,696
Repurchase Agreements [Member] | Asset Pledged as Collateral [Member]
Restricted Cash and Cash Equivalent, Current	$ 82,612	$ 51,171