Note 6 - Pledged Assets - Schedule of Financial Instruments Pledged as Collateral From Counterparties (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Assets pledged	$ 12,893	$ 52,608
Repurchase Agreements [Member]
Assets pledged	8,611	52,608
Derivative [Member]
Assets pledged	4,282	0
Cash [Member]
Assets pledged	8,747	42,179
Cash [Member] | Repurchase Agreements [Member]
Assets pledged	4,465	42,179
Cash [Member] | Derivative [Member]
Assets pledged	4,282	0
US Treasury Securities [Member]
Assets pledged	4,146	10,429
US Treasury Securities [Member] | Repurchase Agreements [Member]
Assets pledged	4,146	10,429
US Treasury Securities [Member] | Derivative [Member]
Assets pledged	$ 0	$ 0