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Note 8 - Allowance for Loan Losses (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]        
Allowance for loan losses, beginning of period $ 1,334,000 $ 1,875,000 $ 1,521,000 $ 1,892,000
Provision for (credit to) loan losses 6,000 (251,000) (50,000) (278,000)
Charge-offs 0 (30,000) (140,000) (30,000)
Recoveries 10,000 9,000 19,000 19,000
Allowance for loan losses, end of period 1,350,000 1,603,000 1,350,000 1,603,000
Charge-offs 0 30,000 140,000 30,000
Commercial Portfolio Segment [Member] | Construction Loans [Member]        
Allowance for loan losses, beginning of period 352,000 285,000 286,000 297,000
Provision for (credit to) loan losses 77,000 (136,000) 143,000 (148,000)
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Allowance for loan losses, end of period 429,000 149,000 429,000 149,000
Charge-offs 0 0 0 0
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member]        
Allowance for loan losses, beginning of period 2,292,000 2,569,000 2,411,000 2,700,000
Provision for (credit to) loan losses (63,000) 141,000 (184,000) 36,000
Charge-offs 0 (57,000) 0 (85,000)
Recoveries 2,000 2,000 4,000 4,000
Allowance for loan losses, end of period 2,231,000 2,655,000 2,231,000 2,655,000
Charge-offs 0 57,000 0 85,000
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member]        
Allowance for loan losses, beginning of period 1,690,000 1,666,000 1,812,000 1,630,000
Provision for (credit to) loan losses (162,000) 266,000 (302,000) 304,000
Charge-offs (20,000) (313,000) (20,000) (317,000)
Recoveries 42,000 16,000 60,000 18,000
Allowance for loan losses, end of period 1,550,000 1,635,000 1,550,000 1,635,000
Charge-offs 20,000 313,000 20,000 317,000
State and Political Subdivisions Portfolio Segment [Member]        
Allowance for loan losses, beginning of period 196,000 253,000 222,000 221,000
Provision for (credit to) loan losses 8,000 (21,000) (18,000) 11,000
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Allowance for loan losses, end of period 204,000 232,000 204,000 232,000
Charge-offs 0 0 0 0
Finance Leases Portfolio Segment [Member]        
Allowance for loan losses, beginning of period 208,000 95,000 164,000 93,000
Provision for (credit to) loan losses 52,000 25,000 105,000 26,000
Charge-offs (43,000) 0 (52,000) (8,000)
Recoveries 9,000 1,000 9,000 10,000
Allowance for loan losses, end of period 226,000 121,000 226,000 121,000
Charge-offs 43,000 0 52,000 8,000
Retail Portfolio Segment [Member] | Family Residential Mortgages [Member]        
Allowance for loan losses, beginning of period 352,000 308,000 350,000 312,000
Provision for (credit to) loan losses (54,000) 5,000 (52,000) 1,000
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Allowance for loan losses, end of period 298,000 313,000 298,000 313,000
Charge-offs 0 0 0 0
Retail Portfolio Segment [Member] | Home Equity Loan [Member]        
Allowance for loan losses, beginning of period 352,000 479,000 428,000 453,000
Provision for (credit to) loan losses (14,000) (12,000) (95,000) 9,000
Charge-offs 0 0 0 0
Recoveries 5,000 7,000 10,000 12,000
Allowance for loan losses, end of period 343,000 474,000 343,000 474,000
Charge-offs 0 0 0 0
Retail Portfolio Segment [Member] | Consumer Loans [Member]        
Allowance for loan losses, beginning of period 69,000 85,000 76,000 85,000
Provision for (credit to) loan losses 15,000 4,000 16,000 15,000
Charge-offs (16,000) (23,000) (33,000) (41,000)
Recoveries 5,000 5,000 14,000 12,000
Allowance for loan losses, end of period 73,000 71,000 73,000 71,000
Charge-offs 16,000 23,000 33,000 41,000
Unallocated Financing Receivables [Member]        
Allowance for loan losses, beginning of period 711,000 363,000 284,000 318,000
Provision for (credit to) loan losses 135,000 39,000 562,000 84,000
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Allowance for loan losses, end of period 846,000 402,000 846,000 402,000
Charge-offs 0 0 0 0
Allowance for loan losses, beginning of period 7,556,000 7,978,000 7,554,000 8,001,000
Provision for (credit to) loan losses 0 60,000 125,000 60,000
Charge-offs (79,000) (423,000) (245,000) (481,000)
Recoveries 73,000 40,000 116,000 75,000
Allowance for loan losses, end of period 7,550,000 7,655,000 7,550,000 7,655,000
Charge-offs $ 79,000 $ 423,000 $ 245,000 $ 481,000