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Note 5 - Loans (Details) - Impaired Loans by Loan Class - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
With no related allowance recorded:    
Recorded investment with no related allowance recorded $ 13,462 $ 16,821
Unpaid principal balance with no related allowance recorded 16,990 21,118
With an allowance recorded:    
Recorded investment with related allowance recorded 5,640 4,569
Unpaid principal balance with related allowance recorded 5,745 4,673
Related allowance 1,068 832
Subtotal:    
Recorded investment 19,102 21,390
Unpaid principle balance 22,735 25,791
Related allowance 1,068 832
Commercial Portfolio Segment [Member]    
With no related allowance recorded:    
Recorded investment with no related allowance recorded 1,908 1,282
Unpaid principal balance with no related allowance recorded 2,232 1,519
With an allowance recorded:    
Recorded investment with related allowance recorded 695 761
Unpaid principal balance with related allowance recorded 766 820
Related allowance 124 122
Subtotal:    
Recorded investment 2,603 2,043
Unpaid principle balance 2,998 2,339
Related allowance 124 122
Commercial Real Estate Portfolio Segment [Member]    
With an allowance recorded:    
Related allowance 94 97
Subtotal:    
Recorded investment 3,555 7,733
Unpaid principle balance 4,317 9,194
Related allowance 94 97
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]    
With no related allowance recorded:    
Recorded investment with no related allowance recorded 1,197 5,488
Unpaid principal balance with no related allowance recorded 1,197 6,226
With an allowance recorded:    
Recorded investment with related allowance recorded 821 824
Unpaid principal balance with related allowance recorded 821 824
Related allowance 32 35
Subtotal:    
Related allowance 32 35
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]    
With no related allowance recorded:    
Recorded investment with no related allowance recorded 1,190 1,071
Unpaid principal balance with no related allowance recorded 1,952 1,794
With an allowance recorded:    
Recorded investment with related allowance recorded 347 350
Unpaid principal balance with related allowance recorded 347 350
Related allowance 62 62
Subtotal:    
Related allowance 62 62
Residential Portfolio Segment [Member]    
With an allowance recorded:    
Related allowance 838 600
Subtotal:    
Recorded investment 12,913 11,582
Unpaid principle balance 15,389 14,226
Related allowance 838 600
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]    
With no related allowance recorded:    
Recorded investment with no related allowance recorded 7,282 7,063
Unpaid principal balance with no related allowance recorded 8,923 8,662
With an allowance recorded:    
Recorded investment with related allowance recorded 1,924 2,044
Unpaid principal balance with related allowance recorded 1,958 2,089
Related allowance 308 321
Subtotal:    
Related allowance 308 321
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]    
With no related allowance recorded:    
Recorded investment with no related allowance recorded 1,742 1,775
Unpaid principal balance with no related allowance recorded 2,543 2,775
Residential Portfolio Segment [Member] | Home Equity Loan [Member]    
With no related allowance recorded:    
Recorded investment with no related allowance recorded 143 142
Unpaid principal balance with no related allowance recorded 143 142
With an allowance recorded:    
Recorded investment with related allowance recorded 1,822 558
Unpaid principal balance with related allowance recorded 1,822 558
Related allowance 530 279
Subtotal:    
Related allowance 530 279
Consumer Portfolio Segment [Member]    
With an allowance recorded:    
Recorded investment with related allowance recorded 31 32
Unpaid principal balance with related allowance recorded 31 32
Related allowance 12 13
Subtotal:    
Recorded investment 31 32
Unpaid principle balance 31 32
Related allowance $ 12 $ 13