Note 3 - Loans (Detail) - Credit Quality Indicators (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Commercial and Industrial
Financing Receivable	$ 961,318	$ 963,762
Pass [Member] | Commercial and Industrial [Member]
Commercial and Industrial
Financing Receivable	135,174	133,678
Pass [Member] | Commercial Real Estate Loans [Member]
Commercial and Industrial
Financing Receivable	376,028	373,577
Watch Loan [Member] | Commercial and Industrial [Member]
Commercial and Industrial
Financing Receivable	6,101	5,367
Watch Loan [Member] | Commercial Real Estate Loans [Member]
Commercial and Industrial
Financing Receivable	51,723	50,790
Special Mention [Member] | Commercial and Industrial [Member]
Commercial and Industrial
Financing Receivable	5,455	5,436
Special Mention [Member] | Commercial Real Estate Loans [Member]
Commercial and Industrial
Financing Receivable	14,918	18,117
Substandard [Member] | Commercial and Industrial [Member]
Commercial and Industrial
Financing Receivable	1,628	1,881
Substandard [Member] | Commercial Real Estate Loans [Member]
Commercial and Industrial
Financing Receivable	8,724	9,655
Impaired Restructured and Accruing Loans [Member] | Commercial and Industrial [Member]
Commercial and Industrial
Financing Receivable	2,418	3,234
Impaired Restructured and Accruing Loans [Member] | Commercial Real Estate Loans [Member]
Commercial and Industrial
Financing Receivable	13,450	12,106
Impaired Restructured and Accruing Loans [Member] | First Lien Residential Mortgage Loans [Member]
Commercial and Industrial
Financing Receivable	4,609	4,953
Impaired Restructured and Accruing Loans [Member] | Junior Lein Residential Mortgage Loans [Member]
Commercial and Industrial
Financing Receivable	233	235
Impaired Restructured and Accruing Loans [Member] | Consumer Loans [Member]
Commercial and Industrial
Financing Receivable	188	191
Impaired Nonaccrual Loans [Member] | Commercial and Industrial [Member]
Commercial and Industrial
Financing Receivable	281	448
Impaired Nonaccrual Loans [Member] | Commercial Real Estate Loans [Member]
Commercial and Industrial
Financing Receivable	6,477	8,427
Doubtful [Member] | Commercial and Industrial [Member]
Commercial and Industrial
Financing Receivable	0	0
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member]
Commercial and Industrial
Financing Receivable	175	25
Performing Financing Receivable [Member] | First Lien Residential Mortgage Loans [Member]
Commercial and Industrial
Financing Receivable	205,671	202,357
Performing Financing Receivable [Member] | Junior Lein Residential Mortgage Loans [Member]
Commercial and Industrial
Financing Receivable	55,609	58,089
Performing Financing Receivable [Member] | Consumer Loans [Member]
Commercial and Industrial
Financing Receivable	65,927	67,042
Loans more than 60 days past due [Member] | First Lien Residential Mortgage Loans [Member]
Commercial and Industrial
Financing Receivable	180	1,046
Loans more than 60 days past due [Member] | Junior Lein Residential Mortgage Loans [Member]
Commercial and Industrial
Financing Receivable	77	96
Loans more than 60 days past due [Member] | Consumer Loans [Member]
Commercial and Industrial
Financing Receivable	106	39
Nonaccrual loans [Member] | First Lien Residential Mortgage Loans [Member]
Commercial and Industrial
Financing Receivable	5,466	6,040
Nonaccrual loans [Member] | Junior Lein Residential Mortgage Loans [Member]
Commercial and Industrial
Financing Receivable	416	327
Nonaccrual loans [Member] | Consumer Loans [Member]
Commercial and Industrial
Financing Receivable	56	401
Commercial and Industrial [Member]
Commercial and Industrial
Financing Receivable	151,057	150,044
Commercial Real Estate Loans [Member]
Commercial and Industrial
Financing Receivable	471,495	472,697
First Lien Residential Mortgage Loans [Member]
Commercial and Industrial
Financing Receivable	215,926	214,396
Junior Lein Residential Mortgage Loans [Member]
Commercial and Industrial
Financing Receivable	56,335	58,747
Consumer Loans [Member]
Commercial and Industrial
Financing Receivable	66,277	67,673
Deferred Fees and Costs [Member]
Commercial and Industrial
Financing Receivable	$ 228	$ 205