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Note 4 - Loans and Related Allowance for Loan Losses (Details) - Impaired Loans by Class - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
With an allowance recorded:    
Recorded investment, with related allowance $ 6,215 $ 4,249
Unpaid principal balance, with related allowance 6,199 4,246
Related allowance 833 1,596
Total:    
Recorded investment 13,681 14,368
Unpaid principal balance 13,653 14,353
Related allowance 833 1,596
Commercial and Industrial [Member]    
With no related allowance recorded:    
Recorded investment, with no related allowance 1,027 1,146
Unpaid principal balance, with no related allowance 1,025 1,145
With an allowance recorded:    
Recorded investment, with related allowance 781 247
Unpaid principal balance, with related allowance 781 247
Related allowance 388 83
Total:    
Recorded investment 1,808 1,393
Unpaid principal balance 1,806 1,392
Related allowance 388 83
Real Estate Construction Porfolio Segment [Member]    
With no related allowance recorded:    
Recorded investment, with no related allowance 1,657 2,707
Unpaid principal balance, with no related allowance 1,651 2,705
With an allowance recorded:    
Recorded investment, with related allowance 130 589
Unpaid principal balance, with related allowance 130 589
Related allowance 130 589
Total:    
Recorded investment 1,787 3,296
Unpaid principal balance 1,781 3,294
Related allowance 130 589
Real Estate Mortgage Portfolio Segment [Member]    
With no related allowance recorded:    
Recorded investment, with no related allowance 7,466 10,119
Unpaid principal balance, with no related allowance 7,454 10,107
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
With no related allowance recorded:    
Recorded investment, with no related allowance 2,445 2,202
Unpaid principal balance, with no related allowance 2,443 2,197
With an allowance recorded:    
Recorded investment, with related allowance 1,436 2,981
Unpaid principal balance, with related allowance 1,436 2,978
Related allowance 276 892
Total:    
Recorded investment 3,881 5,183
Unpaid principal balance 3,879 5,175
Related allowance 276 892
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]    
With no related allowance recorded:    
Recorded investment, with no related allowance 2,337 4,064
Unpaid principal balance, with no related allowance 2,335 4,060
With an allowance recorded:    
Recorded investment, with related allowance 3,862 426
Unpaid principal balance, with related allowance 3,846 426
Related allowance 39 30
Total:    
Recorded investment 6,199 4,490
Unpaid principal balance 6,181 4,486
Related allowance 39 30
Consumer Portfolio Segment [Member]    
With an allowance recorded:    
Recorded investment, with related allowance 6 6
Unpaid principal balance, with related allowance 6 6
Related allowance 0 2
Total:    
Recorded investment 6 6
Unpaid principal balance 6 6
Related allowance $ 0 $ 2