Note 3 - Loans (Details) - Credit Quality Indicators (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Commercial and Industrial
Financing Receivable	$ 974,804	$ 963,762
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Commercial and Industrial
Financing Receivable	0	25
Commercial and Industrial [Member] | Pass [Member]
Commercial and Industrial
Financing Receivable	137,255	133,678
Commercial and Industrial [Member] | Watch Loan [Member]
Commercial and Industrial
Financing Receivable	7,497	5,367
Commercial and Industrial [Member] | Special Mention [Member]
Commercial and Industrial
Financing Receivable	6,259	5,436
Commercial and Industrial [Member] | Substandard [Member]
Commercial and Industrial
Financing Receivable	1,720	1,881
Commercial and Industrial [Member] | Impaired Restructured and Accruing Loans [Member]
Commercial and Industrial
Financing Receivable	2,674	3,234
Commercial and Industrial [Member] | Impaired Nonaccrual Loans [Member]
Commercial and Industrial
Financing Receivable	123	448
Commercial and Industrial [Member] | Doubtful [Member]
Commercial and Industrial
Financing Receivable	0	0
Commercial and Industrial [Member]
Commercial and Industrial
Financing Receivable	155,528	150,044
Commercial Real Estate Loans [Member] | Pass [Member]
Commercial and Industrial
Financing Receivable	386,630	373,577
Commercial Real Estate Loans [Member] | Watch Loan [Member]
Commercial and Industrial
Financing Receivable	47,909	50,790
Commercial Real Estate Loans [Member] | Special Mention [Member]
Commercial and Industrial
Financing Receivable	17,160	18,117
Commercial Real Estate Loans [Member] | Substandard [Member]
Commercial and Industrial
Financing Receivable	6,658	9,655
Commercial Real Estate Loans [Member] | Impaired Restructured and Accruing Loans [Member]
Commercial and Industrial
Financing Receivable	13,794	12,106
Commercial Real Estate Loans [Member] | Impaired Nonaccrual Loans [Member]
Commercial and Industrial
Financing Receivable	5,699	8,427
Commercial Real Estate Loans [Member]
Commercial and Industrial
Financing Receivable	477,850	472,697
First Lien Residential Mortgage Loans [Member] | Impaired Restructured and Accruing Loans [Member]
Commercial and Industrial
Financing Receivable	4,989	4,953
First Lien Residential Mortgage Loans [Member] | Performing Financing Receivable [Member]
Commercial and Industrial
Financing Receivable	202,509	202,357
First Lien Residential Mortgage Loans [Member] | Loans more than 60 days past due [Member]
Commercial and Industrial
Financing Receivable	1,661	1,046
First Lien Residential Mortgage Loans [Member] | Nonaccrual loans [Member]
Commercial and Industrial
Financing Receivable	5,676	6,040
First Lien Residential Mortgage Loans [Member]
Commercial and Industrial
Financing Receivable	214,835	214,396
Junior Lein Residential Mortgage Loans [Member] | Impaired Restructured and Accruing Loans [Member]
Commercial and Industrial
Financing Receivable	250	235
Junior Lein Residential Mortgage Loans [Member] | Performing Financing Receivable [Member]
Commercial and Industrial
Financing Receivable	55,913	58,089
Junior Lein Residential Mortgage Loans [Member] | Loans more than 60 days past due [Member]
Commercial and Industrial
Financing Receivable	19	96
Junior Lein Residential Mortgage Loans [Member] | Nonaccrual loans [Member]
Commercial and Industrial
Financing Receivable	301	327
Junior Lein Residential Mortgage Loans [Member]
Commercial and Industrial
Financing Receivable	56,483	58,747
Consumer Loans [Member] | Impaired Restructured and Accruing Loans [Member]
Commercial and Industrial
Financing Receivable	107	191
Consumer Loans [Member] | Performing Financing Receivable [Member]
Commercial and Industrial
Financing Receivable	69,668	67,042
Consumer Loans [Member] | Loans more than 60 days past due [Member]
Commercial and Industrial
Financing Receivable	14	39
Consumer Loans [Member] | Nonaccrual loans [Member]
Commercial and Industrial
Financing Receivable	50	401
Consumer Loans [Member]
Commercial and Industrial
Financing Receivable	69,839	67,673
Deferred Fees and Costs [Member]
Commercial and Industrial
Financing Receivable	$ 269	$ 205