Note 3 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Nonperforming Assets (Details) - USD ($) $ in Thousands		Sep. 30, 2021		Dec. 31, 2020		Sep. 30, 2020
Nonaccrual loans		$ 39		$ 846		$ 736
Restructured loans in nonaccrual		3,075		2,839		2,866
Total nonperforming loans		3,114	[1]	3,685	[2]	3,602
Other real estate owned, net		957		1,553		1,553
Total nonperforming assets		$ 4,071		$ 5,238		$ 5,155
Ratio of nonperforming assets to loans, net of unearned income and deferred fees and costs, plus other real estate owned		0.51%		0.68%		0.64%
Ratio of allowance for loan losses to nonperforming loans(1)	[3]	247.21%		230.15%		233.98%

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

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

[3] 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.