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Note 5 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Loans Past Due 90 Days or More and Impaired Loans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Loans past due 90 days or more and still accruing $ 17 [1] $ 231 [2]  
Ratio of loans past due 90 days or more and still accruing to loans, net of unearned income and deferred fees and costs 0.00% 0.03%  
Accruing restructured loans $ 1,410 $ 1,729  
Impaired loans:      
Impaired loans with no valuation allowance [3] 3,858 4,174  
Impaired loans with a valuation allowance [3] 1,045 1,115  
Total impaired loans [3] 4,903 5,289  
Valuation allowance (75) (110)  
Impaired loans, net of allowance 4,828 5,179  
Average recorded investment in impaired loans(1) 5,093 [3] 5,359 [3] $ 9,788 [4]
Income recognized on impaired loans, after designation as impaired $ 54 $ 171 $ 250
[1] Only classes with past due or nonaccrual loans are presented
[2] Only classes with past-due or nonaccrual loans are shown.
[3] Only classes with impaired loans are shown.
[4] Recorded investment is net of charge-offs and interest paid while a loan is in nonaccrual status.