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Note 3 - Loans and Allowance for Loan Losses - Aging Analysis of the Recorded Investment in Loans (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Loans past due $ 175 $ 525
Current 93,642 85,388
Loans 93,817 85,913
90 days past due and still accruing
Financing Receivables, 30 to 59 Days Past Due [Member]    
Loans past due 84 194
Financing Receivables, 60 to 89 Days Past Due [Member]    
Loans past due
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Loans past due 91 331
Residential Portfolio Segment [Member]    
Loans past due 175 521
Current 43,814 42,515
Loans 43,989 43,036
90 days past due and still accruing
Residential Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Loans past due 84 194
Residential Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Loans past due
Residential Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Loans past due 91 327
Commercial Real Estate Portfolio Segment [Member]    
Loans past due 4
Current 38,077 32,171
Loans 38,077 32,175
90 days past due and still accruing
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Loans past due
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Loans past due
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Loans past due 4
Construction and Land Real Estate [Member]    
Loans past due
Current 9,669 9,543
Loans 9,669 9,543
90 days past due and still accruing
Construction and Land Real Estate [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Loans past due
Construction and Land Real Estate [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Loans past due
Construction and Land Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Loans past due
Commercial Portfolio Segment [Member]    
Loans past due
Current 1,428 383
Loans 1,428 383
90 days past due and still accruing
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Loans past due
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Loans past due
Commercial Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Loans past due
Consumer Portfolio Segment [Member]    
Loans past due
Current 654 776
Loans 654 776
90 days past due and still accruing
Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Loans past due
Consumer Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Loans past due
Consumer Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Loans past due