Note 4 - Loans and Allowance for Loan Losses (Details) - Troubled Debt Restructuring by Accrual Status (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Modifications [Line Items]
Recorded Investment in loans	$ 306,485	$ 294,478
Troubled Debt Restructuring [Member] \| Residential Mortgage Segment [Member]
Financing Receivable, Modifications [Line Items]
Accruing	492	508
Nonaccrual	166	226
Recorded Investment in loans	658	734
Related Allowance for Loan Losses	6	45
Troubled Debt Restructuring [Member] \| Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Accruing	1,386	1,130
Nonaccrual	338	0
Recorded Investment in loans	1,724	1,130
Related Allowance for Loan Losses	0	0
Troubled Debt Restructuring [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Accruing	0	0
Nonaccrual	1,642	1,709
Recorded Investment in loans	1,642	1,709
Related Allowance for Loan Losses	1,292	1,259
Troubled Debt Restructuring [Member] \| Home Equity And Second Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Accruing	22	24
Nonaccrual	0	0
Recorded Investment in loans	22	24
Related Allowance for Loan Losses	0	0
Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Accruing	1,900	1,662
Nonaccrual	2,146	1,935
Recorded Investment in loans	4,046	3,597
Related Allowance for Loan Losses	1,298	1,304
Residential Mortgage Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment in loans	107,096	107,508
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment in loans	78,480	76,666
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment in loans	28,406	22,003
Home Equity And Second Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Recorded Investment in loans	$ 38,125	$ 35,269

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)(1)(ii)

-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

+ Details

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- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

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- Definition

Reflects the carrying amount of loans deemed to be questionable as to collection on which interest is continuing to be earned or accrued.

+ References

No definition available.

+ Details

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- Definition

Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5111-111524

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