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Note 3 - Loans and Allowance for Loan Losses - Allowance Related to Troubled Debt Restructurings (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Related allowance $ 370,000 $ 444,000
Commercial Portfolio Segment [Member]    
Related allowance 120,000 248,000
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]    
Related allowance 55,000 107,000
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]    
Related allowance 0 0
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]    
Related allowance 65,000 141,000
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]    
Related allowance 0 0
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]    
Related allowance 0 0
Retail Portfolio Segment [Member]    
Related allowance 250,000 196,000
Retail Portfolio Segment [Member] | Home Equity and Other [Member]    
Related allowance 229,000 196,000
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]    
Related allowance $ 21,000 $ 0