Note 5 - Loans (Details Textual) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2016 USD ($)	Sep. 30, 2015	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Extension of Credit [Member]
Commitments and Contingencies	$ 87.2		$ 87.2
Extension of Lines of Credit [Member]
Commitments and Contingencies	$ 231.8		$ 231.8
TDR Loans Transferred to Non-performing, Number of Contracts	0	0	0	1
Financing Receivable, Modifications, Number of Contracts	0	0	4	1
Fair Value of Collateral Dependent Loans as a Percentage of Appraised or Estimated Value of Collateral			85.00%
Collateral Dependent Impaired Loans Measured by Third Party Appraisals			$ 45.3
Collateral Dependent Impaired Loans Measured by Third Party Appraisals Percentage			88.20%
Collateral Dependent Impaired Loans Measured Internally			$ 6.1
Collateral Dependent Impaired Loans Measured Internally Percentage			11.80%
Financing Receivable, Modifications, Transferred to Non-performing Loans				$ 0.4

The amount of collateral dependent impaired loans that are measured by third party appraisals.

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The amount of collateral dependent impaired loans that are measured by third party appraisals. That is expressed as a percentage.

+ References

No definition available.

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The amount of collateral dependent impaired loans that are measured internally.

+ References

No definition available.

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The amount of collateral dependent impaired loans that are measured internally and expressed as a percentage.

+ References

No definition available.

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- Definition

The fair value of a collateral dependent loan expressed as a percentage of appraised or estimated value of collateral.

+ References

No definition available.

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- Definition

The amount of investment in financing receivables transferred into non-performing loans by troubled debt restructurings.

+ References

No definition available.

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Number of TDR loans transferred to non-performing loans during the period.

+ References

No definition available.

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- Definition

Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.(a),19)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.17)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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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