Note 6 - Pledged Assets - Schedule of Financial Instruments Pledged as Collateral From Counterparties (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Assets pledged	$ 4,035	$ 12,893
Repurchase Agreements [Member]
Assets pledged	3,705	8,611
Derivative [Member]
Assets pledged	330	4,282
Cash [Member]
Assets pledged	3,523	8,747
Cash [Member] | Repurchase Agreements [Member]
Assets pledged	3,193	4,465
Cash [Member] | Derivative [Member]
Assets pledged	330	4,282
US Treasury Securities [Member]
Assets pledged	512	4,146
US Treasury Securities [Member] | Repurchase Agreements [Member]
Assets pledged	512	4,146
US Treasury Securities [Member] | Derivative [Member]
Assets pledged	$ 0	$ 0