Note 7 - Loans and Allowance for Loan Losses (Details)	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Note 7 - Loans and Allowance for Loan Losses (Details) [Line Items]
Allowance for Credit Losses, Change in Method of Calculating Impairment	$ 2,000,000		$ 2,000,000	$ 2,200,000
Loans and Leases Receivable, Impaired, Commitment to Lend	0		0	0
Financing Receivable, Modifications, Recorded Investment	$ 24,272,000		$ 24,272,000	$ 24,429,000
Financing Receivable, Modifications, Number of Contracts	3		3	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	$ 0		$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			0	0
Interest Rate Concession and Extended Amortization Term [Member]
Note 7 - Loans and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable, Modifications, Purchase Price Discount		$ 482,000
Financing Receivable, Modifications, Discount in Percentage		15.00%
Financing Receivable, Modifications, Recorded Investment	$ 11,400,000		$ 11,400,000
Percent of Total Restructured Loans	46.90%		46.90%
TDR Financing Receivable [Member]
Note 7 - Loans and Allowance for Loan Losses (Details) [Line Items]
Allowance for Loan and Lease Losses, Period Increase (Decrease)	$ 356,000		$ 356,000

Represents the purchase price discount as a percentage of the purchased principal amount.

No definition available.

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- Definition

Represents the purchase price discount of troubled debt restructurings.

+ References

No definition available.

+ Details

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- References

No definition available.

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- Definition

Represents the total outstanding balance related to a credit that was modified as troubled debt restructuring as a percentage of total restructured loans.

+ References

No definition available.

+ Details

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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.

+ Details

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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))

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

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- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524

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- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

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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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953682-111524

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- Definition

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

+ References

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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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18794-111554

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