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Note 3 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Impaired Loans, Average Investment and Interest Income (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Average recorded investment in impaired loans(1) [1] $ 6,796 $ 5,263 $ 5,093
Interest income recognized on impaired loans, after designation as impaired 105 29 54
Investor Owned Residential Real Estate [Member] | Consumer Real Estate Portfolio Segment [Member]      
Average recorded investment in impaired loans(1) [1],[2] 193 246 196
Interest income recognized on impaired loans, after designation as impaired [2] 6 8 13
Commercial Real Estate, Owner Occupied [Member] | Commercial Real Estate Portfolio Segment [Member]      
Average recorded investment in impaired loans(1) [1],[2] 2,890 3,265 3,217
Interest income recognized on impaired loans, after designation as impaired [2] 7 10 19
Commercial Real Estate Other [Member] | Commercial Real Estate Portfolio Segment [Member]      
Average recorded investment in impaired loans(1) [1],[2] 3,378 868 790
Interest income recognized on impaired loans, after designation as impaired [2] 84 0 0
Commercial and Industrial [Member] | Commercial Non Real Estate Segment [Member]      
Average recorded investment in impaired loans(1) [1],[2] 334 910 887
Interest income recognized on impaired loans, after designation as impaired [2] 8 11 22
Automobile Loan [Member] | Consumer Non Real Estate Portfolio Segment [Member]      
Average recorded investment in impaired loans(1) [1],[2] $ 1 $ 4 3
Interest income recognized on impaired loans, after designation as impaired [2]     $ 0
[1] Recorded investment is net of charge-offs and interest paid while a loan is in nonaccrual status.
[2] Only classes with impaired loans are shown.