Note 2 - Loans and Allowance for Credit Losses - Ratios of Allowance for Loan Losses (Details)		3 Months Ended		12 Months Ended
		Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Ratio of ACLL to the end of period loans, net of unearned income and deferred fees and costs		1.24%	0.95%	0.96%
Ratio of net charge-offs (recoveries), annualized, to average loans, net of unearned income and deferred fees and costs	[1]	(0.04%)	0.01%	0.02%

[1] Net charge-offs are on an annualized basis.