Note 6 - Pledged Assets - Schedule of Financial Instruments Pledged as Collateral From Counterparties (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Assets pledged	$ 8,133	$ 52,608
Repurchase Agreements [Member]
Assets pledged	7,893	52,608
Derivative [Member]
Assets pledged	240	0
Cash [Member]
Assets pledged	6,715	42,179
Cash [Member] | Repurchase Agreements [Member]
Assets pledged	6,475	42,179
Cash [Member] | Derivative [Member]
Assets pledged	240	0
US Treasury Securities [Member]
Assets pledged	1,418	10,429
US Treasury Securities [Member] | Repurchase Agreements [Member]
Assets pledged	1,418	10,429
US Treasury Securities [Member] | Derivative [Member]
Assets pledged	$ 0	$ 0