Note 3 - Investment Securities (Details Textual) Pure in Thousands, $ in Thousands	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)
Debt Securities, Available-for-sale, Holding Greater than 10 Percent of Equity	0	0
Accrued Investment Income Receivable	$ 2,600		$ 1,600
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Ending Balance	0	$ 0
Asset Pledged as Collateral [Member]
Debt Securities, Available-for-Sale, Restricted	$ 191,300	$ 71,200