Note 5 - Loans and the Allowance for Credit Losses - Rollforward of Allowance for Credit Losses for Unfunded Commitments (Details) - Unfunded Loan Commitment [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Balance at beginning of period	$ 2,262	$ 2,343	$ 2,351	$ 0
Provision for credit losses - unfunded commitments	61	37	(28)	(453)
Balance at end of period	$ 2,323	$ 2,380	2,323	2,380
Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance at beginning of period			$ 0	$ 2,833