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Note 8 - Loans and Allowance for Loan Losses (Details) - Loans Disaggregated by Impairment Method - USD ($)
$ in Thousands
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Commercial:            
Allowance for loan losses $ 7,669 $ 7,655 $ 8,001 $ 8,366 $ 8,900 $ 8,925
Allowance for loan losses - individually evaluated for impairment 867   1,194      
Allowance for loan losses - collectively evaluated for impairment 5,867   6,489      
Loans 582,225   555,251      
Loans - individually evaluated for impairment 12,054   21,077      
Loans - collectively evaluated for impairment 570,171   534,174      
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member]            
Commercial:            
Allowance for loan losses 1,535 1,603 1,892 2,276 2,407 2,044
Allowance for loan losses - individually evaluated for impairment 745   1,095      
Allowance for loan losses - collectively evaluated for impairment 790   797      
Loans 121,217   118,845      
Loans - individually evaluated for impairment 4,188   7,115      
Loans - collectively evaluated for impairment 117,029   111,730      
Commercial Portfolio Segment [Member] | Construction Loans [Member]            
Commercial:            
Allowance for loan losses 267 149 297 173 240 439
Allowance for loan losses - collectively evaluated for impairment 267   297      
Loans 25,681   23,471      
Loans - individually evaluated for impairment 346   362      
Loans - collectively evaluated for impairment 25,335   23,109      
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member]            
Commercial:            
Allowance for loan losses 2,164 2,655 2,700 2,472 2,600 2,898
Allowance for loan losses - collectively evaluated for impairment 2,164   2,700      
Loans 212,962   203,534      
Loans - individually evaluated for impairment 5,244   11,546      
Loans - collectively evaluated for impairment 207,718   191,988      
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member]            
Commercial:            
Allowance for loan losses 1,580 1,635 1,630 1,824 1,708 1,632
Allowance for loan losses - individually evaluated for impairment 89   91      
Allowance for loan losses - collectively evaluated for impairment 1,491   1,539      
Loans 57,755   53,077      
Loans - individually evaluated for impairment 1,443   1,567      
Loans - collectively evaluated for impairment 56,312   51,510      
State and Political Subdivisions Portfolio Segment [Member]            
Commercial:            
Allowance for loan losses 228 232 221 194 214 186
Allowance for loan losses - collectively evaluated for impairment 228   221      
Loans 41,443   44,104      
Loans - collectively evaluated for impairment 41,443   44,104      
Finance Leases Portfolio Segment [Member]            
Commercial:            
Allowance for loan losses 122 121 93 76 92 103
Allowance for loan losses - collectively evaluated for impairment 122   93      
Loans 9,858   7,685      
Loans - individually evaluated for impairment 104   16      
Loans - collectively evaluated for impairment 9,754   7,669      
Retail Portfolio Segment [Member]            
Commercial:            
Loans 113,309   104,535      
Retail Portfolio Segment [Member] | 1-4 Family Residential Mortgages [Member]            
Commercial:            
Allowance for loan losses 306 313 312 320 372 303
Allowance for loan losses - individually evaluated for impairment 33   4      
Allowance for loan losses - collectively evaluated for impairment 273   308      
Loans 41,691   37,147      
Loans - individually evaluated for impairment 547   341      
Loans - collectively evaluated for impairment 41,144   36,806      
Retail Portfolio Segment [Member] | Home Equity Loan [Member]            
Commercial:            
Allowance for loan losses 450 474 453 547 520 583
Allowance for loan losses - individually evaluated for impairment     4      
Allowance for loan losses - collectively evaluated for impairment 450   449      
Loans 67,341   63,213      
Loans - individually evaluated for impairment 155   129      
Loans - collectively evaluated for impairment 67,186   63,084      
Retail Portfolio Segment [Member] | Consumer Loans [Member]            
Commercial:            
Allowance for loan losses 82 71 85 121 67 64
Allowance for loan losses - collectively evaluated for impairment 82   85      
Loans 4,277   4,175      
Loans - individually evaluated for impairment 27   1      
Loans - collectively evaluated for impairment 4,250   4,174      
Unallocated Financing Receivables [Member]            
Commercial:            
Allowance for loan losses 935 $ 402 318 $ 363 $ 679 $ 669
Allowance for loan losses - individually evaluated for impairment 0   0      
Allowance for loan losses - collectively evaluated for impairment 0   0      
Loans 0   0      
Loans - individually evaluated for impairment 0   0      
Loans - collectively evaluated for impairment $ 0   $ 0