Note 4 - Loans and Allowance for Loan Losses (Details) (USD $)	12 Months Ended	24 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]
Loans Pledged as Collateral	$ 441,000,000us-gaap_LoansPledgedAsCollateral	$ 484,000,000us-gaap_LoansPledgedAsCollateral	$ 441,000,000us-gaap_LoansPledgedAsCollateral
Loans and Leases Receivable, Gross	931,944,000	999,902,000	931,944,000
Allowance for Credit Losses, Change in Method of Calculating Impairment	2,200,000	2,700,000	2,200,000
Loans and Leases Receivable, Impaired, Commitment to Lend	0	0	0
Financing Receivable, Modifications, Number of Contracts	0	8
Financing Receivable, Modifications, Recorded Investment	24,429,000	26,255,000	24,429,000
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down		0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	1
Debt by Borrowers Discharged under Chapter Seven Bankruptcy [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Modifications, Number of Contracts		7
Financing Receivable, Modifications, Recorded Investment		338,000
Commercial Real Estate Portfolio Segment [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]
Troubled Debt Restructuring, Maturity Date Extension		48 months
Restructured Credit with a Subsequent Default [Member] \| Real Estate Mortgage Residential [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down			0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	8,000
Directors, Executive Officers, Principal Shareholders and Immediate Family Members [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]
Loans and Leases Receivable, Gross	17,900,000		17,900,000
TDR Financing Receivable [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]
Allowance for Loan and Lease Losses, Period Increase (Decrease)		37,000
Real Estate Mortgage Residential [Member]
Note 4 - Loans and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 4,674,000	$ 4,826,000	$ 4,674,000

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The length of time that a maturity date is extended by in a troubled debt restructuring.

+ References

No definition available.

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- Definition

Amount of allowance for credit losses related to receivables which had been measured under a general allowance for credit losses methodology that are now identified as troubled debt restructurings.

+ References

No definition available.

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- Definition

Amount of increase (decrease) of allowance reserve for credit loss.

+ 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))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

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The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 4

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

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Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

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Reflects the amount of the write-down related to a troubled debt restructuring.

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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

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- Definition

Reflects the unfunded portion of contractual agreements to lend funds to borrowers for loans whose terms have been modified by troubled debt restructuring.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 1

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Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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-Publisher FASB

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-Topic 310

-SubTopic 10

-Section 50

-Paragraph 5

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