Note 3 - Loans Receivable - Components of Provision for Credit Losses (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Provision (credit) for loan losses		$ 1,030	[1]	$ (3,990)	[2]	$ 6,340	[2]
Investment securities, provision for credit losses	[2]	0		0		0
Total, provision for credit losses	[1]	968		(3,990)		6,340
Unfunded Loan Commitment [Member]
Provision (credit) for loan losses	[2]	$ (62)		$ 0		$ 0

[1] The Company adopted ASU 2016-13 as of January 1, 2022. The prior year amounts presented are calculated under the prior accounting standard.

[2] The Company adopted ASU 2016-13 as of January 1, 2022. The prior year amounts presented are calculated under the prior accounting standard.