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		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Balance at beginning of period	$ 2,324	$ 2,380	$ 2,352	$ 0
Provision for credit losses - unfunded commitments	662	184	634	(269)
Balance at end of period	$ 2,986	$ 2,564	2,986	2,564
Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance at beginning of period			$ 0	$ 2,833