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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, 2020
Jun. 30, 2019
Dec. 31, 2019
Average recorded investment in impaired loans(1) [1] $ 5,263 $ 6,703 $ 5,359
Interest income recognized on impaired loans, after designation as impaired 29 52 171
Investor Owned Residential Real Estate [Member] | Consumer Real Estate Portfolio Segment [Member]      
Average recorded investment in impaired loans(1) [2] 246 [1] 447 [1] 439 [3]
Interest income recognized on impaired loans, after designation as impaired [2] 8 1 17
Closed End First Liens [Member] | Consumer Real Estate Portfolio Segment [Member]      
Average recorded investment in impaired loans(1) [1],[2]   939  
Interest income recognized on impaired loans, after designation as impaired [2]   7  
Equity Lines [Member] | Consumer Real Estate Portfolio Segment [Member]      
Average recorded investment in impaired loans(1)     98
Interest income recognized on impaired loans, after designation as impaired     6
Closed End Junior Liens [Member] | Consumer Real Estate Portfolio Segment [Member]      
Average recorded investment in impaired loans(1) [1],[2]   198  
Interest income recognized on impaired loans, after designation as impaired [2]   12  
Closed End Junior Liens [Member] | Consumer Real Estate Portfolio Segment [Member] | Financing Receivables 30 to 89 Days Past Due [Member]      
Average recorded investment in impaired loans(1) [4]     225
Closed End Junior Liens [Member] | Consumer Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]      
Average recorded investment in impaired loans(1) [4]     11
Commercial Real Estate, Owner Occupied [Member] | Commercial Real Estate Portfolio Segment [Member]      
Average recorded investment in impaired loans(1) [2] 868 [1] 1,187 [1] 913 [3]
Interest income recognized on impaired loans, after designation as impaired [2] 10 15 41
Commercial Real Estate Other [Member] | Commercial Real Estate Portfolio Segment [Member]      
Average recorded investment in impaired loans(1) [2] 3,235 [1] 2,467 [1] 2,435 [3]
Interest income recognized on impaired loans, after designation as impaired [2]     59
Multifamily Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member]      
Average recorded investment in impaired loans(1) [2]   466 [1] 284 [3]
Interest income recognized on impaired loans, after designation as impaired [2]   5 12
Commercial and Industrial [Member] | Commercial Non Real Estate Segment [Member]      
Average recorded investment in impaired loans(1) [2] 910 [1] 990 [1] 962 [3]
Interest income recognized on impaired loans, after designation as impaired [2] 11 12 25
Automobile Loan [Member] | Consumer Non Real Estate Portfolio Segment [Member]      
Average recorded investment in impaired loans(1) $ 4 [1],[2] $ 9 [1] $ 3 [2],[3]
[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.
[3] Recorded investment is net of charge-offs and interest paid while a loan is in nonaccrual status.
[4] Only classes with past-due or nonaccrual loans are shown.