Note 8 - Internal Risk Ratings and Payment Activity (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	$ 608,124	$ 615,263
Excluding Retail Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	485,866	500,760
Excluding Retail Loans [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	459,264	473,040
Excluding Retail Loans [Member] | Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	4,437	395
Excluding Retail Loans [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	22,165	27,325
Excluding Retail Loans [Member] | Doubtful [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	0	0
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	110,892	124,397
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	102,130	117,246
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	700	0
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	8,062	7,151
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Doubtful [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	0	0
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	32,133	27,372
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	32,122	27,355
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	0	0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	11	17
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Doubtful [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	0	0
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	233,430	235,171
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	218,404	218,958
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member] | Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	3,504	361
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	11,522	15,852
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member] | Doubtful [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	0	0
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	65,671	63,164
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	63,004	60,286
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member] | Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	233	34
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	2,434	2,844
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member] | Doubtful [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	0	0
State and Political Subdivisions Portfolio Segment [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	35,033	40,285
State and Political Subdivisions Portfolio Segment [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	35,033	39,027
State and Political Subdivisions Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	0	0
State and Political Subdivisions Portfolio Segment [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	0	1,258
State and Political Subdivisions Portfolio Segment [Member] | Doubtful [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	0	0
Finance Leases Portfolio Segment [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	8,707	10,371
Finance Leases Portfolio Segment [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	8,571	10,168
Finance Leases Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	0	0
Finance Leases Portfolio Segment [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	136	203
Finance Leases Portfolio Segment [Member] | Doubtful [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases receivable	$ 0	$ 0