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Note 3 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Impaired Loans, Average Investment and Interest Income (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Average recorded investment in impaired loans(1) [1],[2] $ 12,541 $ 12,908 $ 11,585 [3]
Interest income recognized on impaired loans, after designation as impaired 387 476 553 [3]
Real Estate Construction Portfolio Segment[Member] | Construction, 1-4 Family Residential [Member]      
Average recorded investment in impaired loans(1) [1],[3] 3,323 529 462
Interest income recognized on impaired loans, after designation as impaired [3] 133 0 10
Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]      
Average recorded investment in impaired loans(1) [1],[3] 1,107 652 642
Interest income recognized on impaired loans, after designation as impaired [3] 30 28 38
Consumer Real Estate Portfolio Segment [Member] | Closed End Junior Liens [Member]      
Average recorded investment in impaired loans(1) [1],[3] 188 210 207
Interest income recognized on impaired loans, after designation as impaired [3] 8 10 13
Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]      
Average recorded investment in impaired loans(1) [1],[3] 333 74 74
Interest income recognized on impaired loans, after designation as impaired [3] 12 3 4
Commercial Real Estate Portfolio Segment [Member] | Multifamily Real Estate [Member]      
Average recorded investment in impaired loans(1) [1],[3] 310 1,741 1,366
Interest income recognized on impaired loans, after designation as impaired [3] 12 7 12
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]      
Average recorded investment in impaired loans(1) [1],[3] 3,420 4,629 4,342
Interest income recognized on impaired loans, after designation as impaired [3] 140 175 206
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]      
Average recorded investment in impaired loans(1) [1],[3] 2,658 4,372 3,947
Interest income recognized on impaired loans, after designation as impaired [3] 45 252 263
Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]      
Average recorded investment in impaired loans(1) [1],[3] 1,187 697 541
Interest income recognized on impaired loans, after designation as impaired [3] 6 1 7
Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]      
Average recorded investment in impaired loans(1) [1] 15 4 4
Interest income recognized on impaired loans, after designation as impaired $ 1 $ 0 $ 0 [3]
[1] Recorded investment is net of charge-offs and interest paid while a loan is in nonaccrual status.
[2] Recorded investment is net of charge-offs and interest paid while a loan is in nonaccrual status.
[3] Only classes with impaired loans are shown.