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Note 3 - Loans Receivable and Related Allowance for Loan Losses - Classes of Loan Portfolio by Aging Categories (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Loans $ 790,403 $ 809,918
Nonaccrual 2,654 3,523
Financial Asset, Not Past Due [Member]    
Loans 783,741 802,158
Financial Asset, 30 to 59 Days Past Due [Member]    
Loans 2,333 2,962
Nonaccrual 10 70
Financial Asset, 60 to 89 Days Past Due [Member]    
Loans 990 696
Nonaccrual 69 24
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Loans 685 579
Nonaccrual 985 2,021
Residential Portfolio Segment [Member]    
Loans 273,823 308,031
Nonaccrual 810 1,619
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]    
Loans 270,221 304,161
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]    
Loans 1,913 1,836
Nonaccrual 0 70
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]    
Loans 588 239
Nonaccrual 69 0
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Loans 291 176
Nonaccrual 545 1,329
Home Equity Loans and Lines of Credit [Member]    
Loans 75,810 87,088
Nonaccrual 242 75
Home Equity Loans and Lines of Credit [Member] | Financial Asset, Not Past Due [Member]    
Loans 74,853 86,093
Home Equity Loans and Lines of Credit [Member] | Financial Asset, 30 to 59 Days Past Due [Member]    
Loans 230 446
Nonaccrual 0 0
Home Equity Loans and Lines of Credit [Member] | Financial Asset, 60 to 89 Days Past Due [Member]    
Loans 325 328
Nonaccrual 0 0
Home Equity Loans and Lines of Credit [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Loans 160 146
Nonaccrual 238 71
Commercial Real Estate Portfolio Segment [Member]    
Loans 326,341 285,625
Nonaccrual 1,250 1,613
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]    
Loans 325,018 283,373
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]    
Loans 73 580
Nonaccrual 10 0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]    
Loans 0 41
Nonaccrual 0 24
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Loans 0 18
Nonaccrual 188 573
Commercial Portfolio Segment [Member]    
Loans 65,877 89,139
Nonaccrual 338 168
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]    
Loans 65,305 88,614
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]    
Loans 0 72
Nonaccrual 0 0
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]    
Loans 0 46
Nonaccrual 0 0
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Loans 234 239
Nonaccrual 0 0
Consumer Portfolio Segment [Member]    
Loans 48,552 40,035
Nonaccrual 14 48
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]    
Loans 48,344 39,917
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]    
Loans 117 28
Nonaccrual 0 0
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]    
Loans 77 42
Nonaccrual 0 0
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Loans 0 0
Nonaccrual $ 14 $ 48