Note 3 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Nonperforming Assets (Details) - USD ($) $ in Thousands		Mar. 31, 2022		Dec. 31, 2021		Mar. 31, 2021
Nonaccrual loans		$ 29		$ 0		$ 784
TDR loans in nonaccrual		2,833		2,873		2,907
Total nonperforming loans		2,862	[1]	2,873	[1]	3,691
Other real estate owned, net		957		957		957
Total nonperforming assets		$ 3,819		$ 3,830		$ 4,648
Ratio of nonperforming assets to loans, net of unearned income and deferred fees and costs, plus other real estate owned		0.47%		0.48%		0.60%
Ratio of allowance for loan losses to nonperforming loans(1)	[2]	272.12%		267.11%		231.27%

[1] Includes current and past due loans in nonaccrual status. Includes impaired loans in nonaccrual status.

[2] The Company defines nonperforming loans as nonaccrual loans and restructured loans that are nonaccrual. Loans 90 days past due and still accruing and accruing restructured loans are excluded.