Note 7 - Loans and Allowance for Loan Losses (Details)	3 Months Ended
Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Note 7 - Loans and Allowance for Loan Losses (Details) [Line Items]
Allowance for Credit Losses, Change in Method of Calculating Impairment	$ 1,800,000		$ 1,900,000
Loans and Leases Receivable, Impaired, Commitment to Lend	$ 0		0
Financing Receivable, Modifications, Number of Contracts	0	0
Financing Receivable, Modifications, Recorded Investment	$ 23,687,000		$ 23,831,000
Purchased Loan at Discount [Member]
Note 7 - Loans and Allowance for Loan Losses (Details) [Line Items]
Financing Receivable Modifications, Purchase Price Discount		$ 482,000
Financing Receivable Modification Discount in Percentage		15.00%
Financing Receivable, Modifications, Recorded Investment	$ 11,200,000
Percent of Total Restructed Loans	47.20%

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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Period Type:	instant

- 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

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=66008989&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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

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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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