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Note 3 - Loans and Allowance for Loan Losses - Allowance Related to Troubled Debt Restructurings (Details) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Related allowance $ 544,000 $ 694,000
Commercial Portfolio Segment [Member]    
Related allowance 439,000 642,000
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]    
Related allowance 155,000 9,000
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]    
Related allowance 12,000 28,000
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]    
Related allowance 164,000 100,000
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]    
Related allowance 4,000 247,000
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]    
Related allowance 104,000 258,000
Retail Portfolio Segment [Member]    
Related allowance 105,000 52,000
Retail Portfolio Segment [Member] | Home Equity and Other [Member]    
Related allowance 101,000 48,000
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]    
Related allowance $ 4,000 $ 4,000