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Note 3 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Impaired Loans and Associated Reserves (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Principal Balance $ 9,737 $ 9,820  
Total Recorded Investment 9,066 [1] 9,173 [1] $ 13,989
Impaired loans with no valuation allowance 8,172 [1] 8,269 [1] 12,171
Impaired loans with a valuation allowance 894 [1] 904 [1] 1,818
Related Allowance 25 26 $ 80
Real Estate Construction Portfolio Segment[Member] | Construction, 1-4 Family Residential [Member]      
Principal Balance [2] 280 280  
Total Recorded Investment [1],[2] 266 270  
Impaired loans with no valuation allowance [1],[2] 266 270  
Impaired loans with a valuation allowance [1],[2] 0 0  
Related Allowance [2] 0 0  
Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]      
Principal Balance [2] 642 648  
Total Recorded Investment [1],[2] 604 609  
Impaired loans with no valuation allowance [1],[2] 266 267  
Impaired loans with a valuation allowance [1],[2] 338 342  
Related Allowance [2] 13 14  
Consumer Real Estate Portfolio Segment [Member] | Closed End Junior Liens [Member]      
Principal Balance [2] 191 195  
Total Recorded Investment [1],[2] 191 195  
Impaired loans with no valuation allowance [1],[2] 0 0  
Impaired loans with a valuation allowance [1],[2] 191 195  
Related Allowance [2] 7 7  
Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]      
Principal Balance [2] 72 73  
Total Recorded Investment [1],[2] 72 73  
Impaired loans with no valuation allowance [1],[2] 0 0  
Impaired loans with a valuation allowance [1],[2] 72 73  
Related Allowance [2] 4 4  
Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member]      
Principal Balance [2] 1,364 1,364  
Total Recorded Investment [1],[2] 1,091 1,091  
Impaired loans with no valuation allowance [1],[2] 1,091 1,091  
Impaired loans with a valuation allowance [1],[2] 0 0  
Related Allowance [2] 0 0  
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]      
Principal Balance [2] 3,990 4,005  
Total Recorded Investment [1],[2] 3,940 3,957  
Impaired loans with no valuation allowance [1],[2] 3,647 3,663  
Impaired loans with a valuation allowance [1],[2] 293 294  
Related Allowance [2] 1 1  
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]      
Principal Balance [2] 2,974 2,997  
Total Recorded Investment [1],[2] 2,695 2,734  
Impaired loans with no valuation allowance [1],[2] 2,695 2,734  
Impaired loans with a valuation allowance [1],[2] 0 0  
Related Allowance [2] 0 0  
Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]      
Principal Balance [2] 221 255  
Total Recorded Investment [1],[2] 205 241  
Impaired loans with no valuation allowance [1],[2] 205 241  
Impaired loans with a valuation allowance [1],[2] 0 0  
Related Allowance [2] 0 0  
Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]      
Principal Balance 3 3 [2]  
Total Recorded Investment [1] 2 3 [2]  
Impaired loans with no valuation allowance [1] 2 3 [2]  
Impaired loans with a valuation allowance [1] 0 0 [2]  
Related Allowance $ 0 $ 0 [2]  
[1] Recorded investment is net of charge-offs and interest paid while a loan is in nonaccrual status.
[2] Only classes with impaired loans are shown.