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Note 3 - Loans and Allowance for Loan Losses - Nonperforming Loans (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Nonperforming Financial Instruments [Member] | Originated Loan [Member]    
Loans past due 90 days or more still accruing interest $ 0 $ 0
Nonaccrual loans 1,696,000 1,954,000
Total nonperforming 1,696,000 1,954,000
Nonperforming Financial Instruments [Member] | Acquired Loan [Member]    
Loans past due 90 days or more still accruing interest 0 5,000
Nonaccrual loans 2,973,000 3,485,000
Total nonperforming 2,973,000 3,490,000
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]    
Total nonperforming 382,000 458,000
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]    
Total nonperforming 110,000 155,000
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]    
Total nonperforming 801,000 1,797,000
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]    
Total nonperforming 673,000 79,000
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residentia lRental Loan [Member]    
Total nonperforming 169,000 157,000
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]    
Total nonperforming 2,135,000 2,646,000
Nonperforming Financial Instruments [Member] | Retail Portfolio Segment [Member] | Home Equity and Other [Member]    
Total nonperforming 654,000 771,000
Nonperforming Financial Instruments [Member] | Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]    
Total nonperforming 1,880,000 2,027,000
Nonperforming Financial Instruments [Member] | Retail Portfolio Segment [Member]    
Total nonperforming 2,534,000 2,798,000
Nonperforming Financial Instruments [Member]    
Total nonperforming 4,669,000 5,444,000
Originated Loan [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]    
Loans past due 90 days or more still accruing interest 0 0
Originated Loan [Member] | Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]    
Loans past due 90 days or more still accruing interest 0 0
Originated Loan [Member] | Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]    
Loans past due 90 days or more still accruing interest 0 0
Originated Loan [Member] | Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]    
Loans past due 90 days or more still accruing interest 0 0
Originated Loan [Member] | Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residentia lRental Loan [Member]    
Loans past due 90 days or more still accruing interest 0 0
Originated Loan [Member] | Commercial Portfolio Segment [Member]    
Loans past due 90 days or more still accruing interest 0 0
Originated Loan [Member] | Retail Portfolio Segment [Member] | Home Equity and Other [Member]    
Loans past due 90 days or more still accruing interest 0 0
Originated Loan [Member] | Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]    
Loans past due 90 days or more still accruing interest 0 0
Originated Loan [Member] | Retail Portfolio Segment [Member]    
Loans past due 90 days or more still accruing interest 0 0
Originated Loan [Member]    
Loans past due 90 days or more still accruing interest 0 0
Acquired Loan [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]    
Loans past due 90 days or more still accruing interest 0 0
Acquired Loan [Member] | Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]    
Loans past due 90 days or more still accruing interest 0 0
Acquired Loan [Member] | Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]    
Loans past due 90 days or more still accruing interest 0 0
Acquired Loan [Member] | Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]    
Loans past due 90 days or more still accruing interest 0 0
Acquired Loan [Member] | Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residentia lRental Loan [Member]    
Loans past due 90 days or more still accruing interest 0 0
Acquired Loan [Member] | Commercial Portfolio Segment [Member]    
Loans past due 90 days or more still accruing interest 0 0
Acquired Loan [Member] | Retail Portfolio Segment [Member] | Home Equity and Other [Member]    
Loans past due 90 days or more still accruing interest 0 5,000
Acquired Loan [Member] | Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]    
Loans past due 90 days or more still accruing interest 0 0
Acquired Loan [Member] | Retail Portfolio Segment [Member]    
Loans past due 90 days or more still accruing interest 0 5,000
Acquired Loan [Member]    
Loans past due 90 days or more still accruing interest $ 0 $ 5,000