Note 5 - Pledged Assets - Schedule of Financial Instruments Pledged as Collateral From Counterparties (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Cash	$ 16,293	$ 11,545
Repurchase Agreements [Member]
Cash	3,272	4,339
Derivative [Member]
Cash	13,021	7,206
Cash [Member]
Cash	16,096	11,545
Cash [Member] | Repurchase Agreements [Member]
Cash	3,075	4,339
Cash [Member] | Derivative [Member]
Cash	13,021	7,206
US Treasury Securities [Member]
Cash	197	0
US Treasury Securities [Member] | Repurchase Agreements [Member]
Cash	197	0
US Treasury Securities [Member] | Derivative [Member]
Cash	$ 0	$ 0