Note 6 - Pledged Assets - Schedule of Financial Instruments Pledged as Collateral From Counterparties (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Assets pledged	$ 141,633	$ 12,893
Cash [Member]
Assets pledged	12,909	8,747
US Treasury Securities [Member]
Assets pledged	128,724	4,146
Repurchase Agreements [Member]
Assets pledged	12,549	8,611
Repurchase Agreements [Member] | Cash [Member]
Assets pledged	12,549	4,465
Repurchase Agreements [Member] | US Treasury Securities [Member]
Assets pledged	0	4,146
Reverse Repurchase Agreement [Member]
Assets pledged	128,724	0
Reverse Repurchase Agreement [Member] | Cash [Member]
Assets pledged	0	0
Reverse Repurchase Agreement [Member] | US Treasury Securities [Member]
Assets pledged	128,724	0
Derivative [Member]
Assets pledged	360	4,282
Derivative [Member] | Cash [Member]
Assets pledged	360	4,282
Derivative [Member] | US Treasury Securities [Member]
Assets pledged	$ 0	$ 0