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Note 7 - Loans (Details) - Impaired Loans - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
With no related allowance recorded:    
Unpaid principal - with no allowance $ 9,350 $ 10,616
Recorded investment - with no allowance 7,764 9,075
With a related allowance recorded:    
Unpaid principal - with allowance 3,880 3,241
Recorded investment - with allowance 3,880 3,241
Related allowance - with allowance 600 769
Total 13,230 13,857
Total 11,644 12,316
Total 600 769
Residential Portfolio Segment [Member] | Senior Lien [Member] | Real Estate Loan [Member]    
With no related allowance recorded:    
Unpaid principal - with no allowance 651 950
Recorded investment - with no allowance 651 950
With a related allowance recorded:    
Unpaid principal - with allowance 1,104 715
Recorded investment - with allowance 1,104 715
Related allowance - with allowance 136 358
Total 136 358
Residential Portfolio Segment [Member] | Junior Lien [Member] | Real Estate Loan [Member]    
With no related allowance recorded:    
Unpaid principal - with no allowance 77 17
Recorded investment - with no allowance 77 17
With a related allowance recorded:    
Unpaid principal - with allowance 322 16
Recorded investment - with allowance 322 16
Related allowance - with allowance 80 16
Total 80 16
Commercial Portfolio Segment [Member] | Real Estate Loan [Member]    
With no related allowance recorded:    
Unpaid principal - with no allowance 7,409 8,062
Recorded investment - with no allowance 5,823 6,521
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]    
With no related allowance recorded:    
Unpaid principal - with no allowance 257 513
Recorded investment - with no allowance 257 513
With a related allowance recorded:    
Unpaid principal - with allowance 75 150
Recorded investment - with allowance 75 150
Related allowance - with allowance 75 82
Total 75 82
Commercial Portfolio Segment [Member] | Commercial Construction and Land [Member]    
With no related allowance recorded:    
Unpaid principal - with no allowance 25 124
Recorded investment - with no allowance 25 124
With a related allowance recorded:    
Unpaid principal - with allowance 1,815 1,815
Recorded investment - with allowance 1,815 1,815
Related allowance - with allowance 211 211
Total 211 211
Commercial Portfolio Segment [Member] | Loans Secured by Farmland [Member]    
With no related allowance recorded:    
Unpaid principal - with no allowance 910 925
Recorded investment - with no allowance 910 925
With a related allowance recorded:    
Unpaid principal - with allowance 564 545
Recorded investment - with allowance 564 545
Related allowance - with allowance 98 102
Total 98 102
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]    
With no related allowance recorded:    
Unpaid principal - with no allowance 21 25
Recorded investment - with no allowance 21 25
With a related allowance recorded:    
Unpaid principal - with allowance 0 0
Recorded investment - with allowance 0 0
Related allowance - with allowance 0 0
Total $ 0 $ 0