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Note 8 - Loans Disaggregated by Impairment Method (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses $ 7,593 $ 7,550 $ 7,554 $ 7,669 $ 7,655 $ 8,001
Allowance for loan losses - individually evaluated for impairment 717   974      
Allowance for loan losses - collectively evaluated for impairment 6,008   6,296      
Loans and leases receivable 608,124   615,263      
Loans - individually evaluated for impairment 12,773   14,941      
Loans - collectively evaluated for impairment 595,351   600,322      
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 1,304 1,350 1,521 1,535 1,603 1,892
Allowance for loan losses - individually evaluated for impairment 462   712      
Allowance for loan losses - collectively evaluated for impairment 842   809      
Loans and leases receivable 110,892   124,397      
Loans - individually evaluated for impairment 3,820   4,586      
Loans - collectively evaluated for impairment 107,072   119,811      
Commercial Portfolio Segment [Member] | Construction Loans [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 350 429 286 267 149 297
Allowance for loan losses - individually evaluated for impairment 0   0      
Allowance for loan losses - collectively evaluated for impairment 350   286      
Loans and leases receivable 32,133   27,372      
Loans - individually evaluated for impairment 280   364      
Loans - collectively evaluated for impairment 31,853   27,008      
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 2,466 2,231 2,411 2,164 2,655 2,700
Allowance for loan losses - individually evaluated for impairment 0   14      
Allowance for loan losses - collectively evaluated for impairment 2,466   2,397      
Loans and leases receivable 233,430   235,171      
Loans - individually evaluated for impairment 6,050   6,998      
Loans - collectively evaluated for impairment 227,380   228,173      
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 1,543 1,550 1,812 1,580 1,635 1,630
Allowance for loan losses - individually evaluated for impairment 189   203      
Allowance for loan losses - collectively evaluated for impairment 1,354   1,609      
Loans and leases receivable 65,671   63,164      
Loans - individually evaluated for impairment 1,716   2,113      
Loans - collectively evaluated for impairment 63,955   61,051      
State and Political Subdivisions Portfolio Segment [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 140 204 222 228 232 221
Allowance for loan losses - individually evaluated for impairment 0   0      
Allowance for loan losses - collectively evaluated for impairment 140   222      
Loans and leases receivable 35,033   40,285      
Loans - individually evaluated for impairment 0   0      
Loans - collectively evaluated for impairment 35,033   40,285      
Finance Leases Portfolio Segment [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 220 226 164 122 121 93
Allowance for loan losses - individually evaluated for impairment 55   20      
Allowance for loan losses - collectively evaluated for impairment 165   144      
Loans and leases receivable 8,707   10,371      
Loans - individually evaluated for impairment 132   146      
Loans - collectively evaluated for impairment 8,575   10,225      
Retail Portfolio Segment [Member] | Consumer Loans [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 84 73 76 82 71 85
Allowance for loan losses - individually evaluated for impairment 0   0      
Allowance for loan losses - collectively evaluated for impairment 84   76      
Loans and leases receivable 5,306   4,286      
Loans - individually evaluated for impairment 95          
Loans - collectively evaluated for impairment 5,211   4,286      
Retail Portfolio Segment [Member] | Family Residential Mortgages [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 278 298 350 306 313 312
Allowance for loan losses - individually evaluated for impairment 11   25      
Allowance for loan losses - collectively evaluated for impairment 267   325      
Loans and leases receivable 46,544   42,833      
Loans - individually evaluated for impairment 561   583      
Loans - collectively evaluated for impairment 45,983   42,250      
Retail Portfolio Segment [Member] | Home Equity Loan [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses 340 343 428 450 474 453
Allowance for loan losses - individually evaluated for impairment 0          
Allowance for loan losses - collectively evaluated for impairment 340   428      
Loans and leases receivable 70,408   67,384      
Loans - individually evaluated for impairment 119   151      
Loans - collectively evaluated for impairment 70,289   67,233      
Unallocated Financing Receivables [Member]            
Credit Losses Related To Financing Receivables Current And Noncurrent [Line Items]            
Allowance for loan losses $ 868 $ 846 $ 284 $ 935 $ 402 $ 318