Note 3 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Nonperforming Assets (Details) - USD ($) $ in Thousands		Mar. 31, 2021		Dec. 31, 2020		Mar. 31, 2020
Nonaccrual loans		$ 784		$ 846		$ 261
Restructured loans in nonaccrual		2,907		2,839		3,191
Total nonperforming loans		3,691	[1],[2]	3,685	[2],[3]	3,452
Other real estate owned, net		957		1,553		1,584
Total nonperforming assets		$ 4,648		$ 5,238		$ 5,036
Ratio of nonperforming assets to loans, net of unearned income and deferred fees and costs, plus other real estate owned		0.60%		0.68%		0.69%
Ratio of allowance for loan losses to nonperforming loans(1)	[4]	231.27%		230.15%		209.73%

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

[2] Only classes with past due or nonaccrual loans are shown.

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

[4] 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.