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Note 5 - Loans and Related Allowance for Loan Losses - Credit Quality Information (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Loans $ 952,496 $ 912,872
Pass [Member]    
Loans 919,809 881,217
Special Mention [Member]    
Loans 24,585 26,021
Substandard [Member]    
Loans 7,383 3,396
Doubtful [Member]    
Loans 719 2,238
Residential Portfolio Segment [Member] | Real Estate Sector [Member]    
Loans 347,766 326,769
Residential Portfolio Segment [Member] | Real Estate Sector [Member] | Pass [Member]    
Loans 343,851 323,362
Residential Portfolio Segment [Member] | Real Estate Sector [Member] | Special Mention [Member]    
Loans 1,997 1,922
Residential Portfolio Segment [Member] | Real Estate Sector [Member] | Substandard [Member]    
Loans 1,918 1,485
Residential Portfolio Segment [Member] | Real Estate Sector [Member] | Doubtful [Member]    
Loans
Commercial Portfolio Segment [Member] | Real Estate Sector [Member]    
Loans 351,360 307,064
Commercial Portfolio Segment [Member] | Real Estate Sector [Member] | Pass [Member]    
Loans 335,436 292,233
Commercial Portfolio Segment [Member] | Real Estate Sector [Member] | Special Mention [Member]    
Loans 12,260 12,476
Commercial Portfolio Segment [Member] | Real Estate Sector [Member] | Substandard [Member]    
Loans 3,664 1,184
Commercial Portfolio Segment [Member] | Real Estate Sector [Member] | Doubtful [Member]    
Loans 1,171
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member]    
Loans 85,586 91,463
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] | Pass [Member]    
Loans 75,201 81,534
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] | Special Mention [Member]    
Loans 7,975 8,618
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] | Substandard [Member]    
Loans 1,691 244
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] | Doubtful [Member]    
Loans 719 1,067
Construction Portfolio Segment [Member] | Real Estate Sector [Member]    
Loans 35,605 48,824
Construction Portfolio Segment [Member] | Real Estate Sector [Member] | Pass [Member]    
Loans 33,342 45,522
Construction Portfolio Segment [Member] | Real Estate Sector [Member] | Special Mention [Member]    
Loans 2,263 2,902
Construction Portfolio Segment [Member] | Real Estate Sector [Member] | Substandard [Member]    
Loans 400
Construction Portfolio Segment [Member] | Real Estate Sector [Member] | Doubtful [Member]    
Loans
Consumer Portfolio Segment [Member]    
Loans 113,637 122,241
Consumer Portfolio Segment [Member] | Pass [Member]    
Loans 113,527 122,158
Consumer Portfolio Segment [Member] | Special Mention [Member]    
Loans
Consumer Portfolio Segment [Member] | Substandard [Member]    
Loans 110 83
Consumer Portfolio Segment [Member] | Doubtful [Member]    
Loans
Other Portfolio Segment [Member]    
Loans 18,542 16,511
Other Portfolio Segment [Member] | Pass [Member]    
Loans 18,452 16,408
Other Portfolio Segment [Member] | Special Mention [Member]    
Loans 90 103
Other Portfolio Segment [Member] | Substandard [Member]    
Loans
Other Portfolio Segment [Member] | Doubtful [Member]    
Loans