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Note 7 - Loans and Related Allowance for Loan Losses (Details) - Impaired Loans by Class - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
With no related allowance recorded:    
Recorded investment, with no related allowance $ 8,583  
Unpaid principal balance, with no related allowance 8,567  
811  
Recorded investment, with related allowance 7,064 $ 6,215
Unpaid principal balance, with related allowance 7,053 6,199
Related allowance 811 833
Total:    
Recorded investment 15,647 13,681
Unpaid principal balance 15,620 13,653
Related allowance 811 833
Commercial Loans [Member]    
With no related allowance recorded:    
Recorded investment, with related allowance 6,920  
Unpaid principal balance, with related allowance 6,906  
Related allowance 101  
Total:    
Related allowance 101  
Commercial and Industrial [Member]    
With no related allowance recorded:    
Recorded investment, with no related allowance 477 1,027
Unpaid principal balance, with no related allowance 477 1,025
Recorded investment, with related allowance 388 781
Unpaid principal balance, with related allowance 388 781
Related allowance 323 388
Total:    
Recorded investment 865 1,808
Unpaid principal balance 865 1,806
Related allowance 323 388
Real Estate Construction Porfolio Segment [Member]    
With no related allowance recorded:    
Recorded investment, with no related allowance 1,335 1,657
Unpaid principal balance, with no related allowance 1,330 1,651
Recorded investment, with related allowance 118 130
Unpaid principal balance, with related allowance 118 130
Related allowance 118 130
Total:    
Recorded investment 1,453 1,787
Unpaid principal balance 1,448 1,781
Related allowance 118 130
Real Estate Construction Porfolio Segment [Member] | Residential Loan [Member]    
With no related allowance recorded:    
Recorded investment, with related allowance 1,157  
Unpaid principal balance, with related allowance 1,155  
Related allowance 269  
Total:    
Related allowance 269  
Real Estate Mortgage Portfolio Segment [Member]    
With no related allowance recorded:    
Recorded investment, with no related allowance   7,466
Unpaid principal balance, with no related allowance   7,454
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
With no related allowance recorded:    
Recorded investment, with no related allowance 2,928 2,445
Unpaid principal balance, with no related allowance 2,926 2,443
Recorded investment, with related allowance   1,436
Unpaid principal balance, with related allowance   1,436
Related allowance 269 276
Total:    
Recorded investment 4,085 3,881
Unpaid principal balance 4,081 3,879
Related allowance 269 276
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]    
With no related allowance recorded:    
Recorded investment, with no related allowance 2,319 2,337
Unpaid principal balance, with no related allowance 2,315 2,335
Recorded investment, with related allowance   3,862
Unpaid principal balance, with related allowance   3,846
Related allowance 101 39
Total:    
Recorded investment 9,239 6,199
Unpaid principal balance 9,221 6,181
Related allowance 101 39
Consumer Portfolio Segment [Member]    
With no related allowance recorded:    
Recorded investment, with related allowance 5 6
Unpaid principal balance, with related allowance 5 6
Related allowance   0
Total:    
Recorded investment 5 6
Unpaid principal balance $ 5 6
Related allowance   $ 0