Note 8 - Loans and Allowance for Loan Losses (Details) - Internal Risk Ratings and Payment Activity - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Commercial:
Loans and Leases receivable	$ 582,225	$ 555,251
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member]
Commercial:
Loans and Leases receivable	121,217	118,845
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member] | Pass [Member]
Commercial:
Loans and Leases receivable	115,993	111,560
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member] | Special Mention [Member]
Commercial:
Loans and Leases receivable	329	42
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member] | Substandard [Member]
Commercial:
Loans and Leases receivable	4,895	7,243
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Commercial:
Loans and Leases receivable	25,681	23,471
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]
Commercial:
Loans and Leases receivable	25,661	22,981
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]
Commercial:
Loans and Leases receivable		128
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member]
Commercial:
Loans and Leases receivable	20	362
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member]
Commercial:
Loans and Leases receivable	212,962	203,534
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member] | Pass [Member]
Commercial:
Loans and Leases receivable	196,047	178,339
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member] | Special Mention [Member]
Commercial:
Loans and Leases receivable	2,019	2,418
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member] | Substandard [Member]
Commercial:
Loans and Leases receivable	14,896	22,777
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member]
Commercial:
Loans and Leases receivable	57,755	53,077
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member] | Pass [Member]
Commercial:
Loans and Leases receivable	54,866	50,172
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member] | Special Mention [Member]
Commercial:
Loans and Leases receivable	711	408
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member] | Substandard [Member]
Commercial:
Loans and Leases receivable	2,178	2,497
State and Political Subdivisions Portfolio Segment [Member]
Commercial:
Loans and Leases receivable	41,443	44,104
State and Political Subdivisions Portfolio Segment [Member] | Pass [Member]
Commercial:
Loans and Leases receivable	40,170	42,771
State and Political Subdivisions Portfolio Segment [Member] | Substandard [Member]
Commercial:
Loans and Leases receivable	1,273	1,333
Finance Leases Portfolio Segment [Member]
Commercial:
Loans and Leases receivable	9,858	7,685
Finance Leases Portfolio Segment [Member] | Pass [Member]
Commercial:
Loans and Leases receivable	9,658	7,543
Finance Leases Portfolio Segment [Member] | Substandard [Member]
Commercial:
Loans and Leases receivable	200	142
Commercial, State and Political Subdivision and Lease Financing Portfolio Segments [Member]
Commercial:
Loans and Leases receivable	468,916	450,716
Commercial, State and Political Subdivision and Lease Financing Portfolio Segments [Member] | Pass [Member]
Commercial:
Loans and Leases receivable	442,395	413,366
Commercial, State and Political Subdivision and Lease Financing Portfolio Segments [Member] | Special Mention [Member]
Commercial:
Loans and Leases receivable	3,059	2,996
Commercial, State and Political Subdivision and Lease Financing Portfolio Segments [Member] | Substandard [Member]
Commercial:
Loans and Leases receivable	23,462	34,354
Retail Portfolio Segment [Member]
Commercial:
Loans and Leases receivable	113,309	104,535
Retail Portfolio Segment [Member] | 1-4 Family Residential Mortgages [Member]
Commercial:
Loans and Leases receivable	41,691	37,147
Retail Portfolio Segment [Member] | Home Equity Loan [Member]
Commercial:
Loans and Leases receivable	67,341	63,213
Retail Portfolio Segment [Member] | Consumer Loans [Member]
Commercial:
Loans and Leases receivable	4,277	4,175
Retail Portfolio Segment [Member] | Performing Financial Instruments [Member]
Commercial:
Loans and Leases receivable	112,859	104,205
Retail Portfolio Segment [Member] | Performing Financial Instruments [Member] | 1-4 Family Residential Mortgages [Member]
Commercial:
Loans and Leases receivable	41,399	36,922
Retail Portfolio Segment [Member] | Performing Financial Instruments [Member] | Home Equity Loan [Member]
Commercial:
Loans and Leases receivable	67,210	63,109
Retail Portfolio Segment [Member] | Performing Financial Instruments [Member] | Consumer Loans [Member]
Commercial:
Loans and Leases receivable	4,250	4,174
Retail Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Commercial:
Loans and Leases receivable	450	330
Retail Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | 1-4 Family Residential Mortgages [Member]
Commercial:
Loans and Leases receivable	292	225
Retail Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Home Equity Loan [Member]
Commercial:
Loans and Leases receivable	131	104
Retail Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Consumer Loans [Member]
Commercial:
Loans and Leases receivable	$ 27	$ 1