Note 8 - Loans and Allowance for Loan Losses (Details) - Past Due Loans - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Commercial:
Loans past due	$ 2,455	$ 6,703
Loans current	579,770	548,548
Loans	582,225	555,251
Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Loans past due	348	1,993
Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial:
Loans past due	690	963
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial:
Loans past due	1,417	3,747
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member]
Commercial:
Loans past due	54
Loans current	121,163	118,845
Loans	121,217	118,845
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Loans past due	54
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Commercial:
Loans past due		466
Loans current	25,681	23,005
Loans	25,681	23,471
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Loans past due		466
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member]
Commercial:
Loans past due	1,140	4,107
Loans current	211,822	199,427
Loans	212,962	203,534
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Loans past due		28
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial:
Loans past due	65	332
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial:
Loans past due	1,075	3,747
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member]
Commercial:
Loans past due	778	1,174
Loans current	56,977	51,903
Loans	57,755	53,077
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Loans past due	102	600
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial:
Loans past due	512	574
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial:
Loans past due	164
State and Political Subdivisions Portfolio Segment [Member]
Commercial:
Loans current	41,443	44,104
Loans	41,443	44,104
Finance Leases Portfolio Segment [Member]
Commercial:
Loans past due	225	291
Loans current	9,633	7,394
Loans	9,858	7,685
Finance Leases Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Loans past due	66	291
Finance Leases Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial:
Loans past due	26
Finance Leases Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial:
Loans past due	133
Retail Portfolio Segment [Member]
Commercial:
Loans	113,309	104,535
Retail Portfolio Segment [Member] | 1-4 Family Residential Mortgages [Member]
Commercial:
Loans past due	59	526
Loans current	41,632	36,621
Loans	41,691	37,147
Retail Portfolio Segment [Member] | 1-4 Family Residential Mortgages [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Loans past due		526
Retail Portfolio Segment [Member] | 1-4 Family Residential Mortgages [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial:
Loans past due	59
Retail Portfolio Segment [Member] | Home Equity Loan [Member]
Commercial:
Loans past due	139	115
Loans current	67,202	63,098
Loans	67,341	63,213
Retail Portfolio Segment [Member] | Home Equity Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Loans past due	94	66
Retail Portfolio Segment [Member] | Home Equity Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial:
Loans past due		49
Retail Portfolio Segment [Member] | Home Equity Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Commercial:
Loans past due	45
Retail Portfolio Segment [Member] | Consumer Loans [Member]
Commercial:
Loans past due	60	24
Loans current	4,217	4,151
Loans	4,277	4,175
Retail Portfolio Segment [Member] | Consumer Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Commercial:
Loans past due	32	16
Retail Portfolio Segment [Member] | Consumer Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Commercial:
Loans past due	$ 28	$ 8