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Note 7 - Loans and Related Allowance for Loan and Lease Losses - Troubled Debt Restructurings Subsequently Defaulted (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Extended Maturity [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1
Extended Maturity [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1
Other Restructurings [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 3,000
Other Restructurings [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 58,000
Commercial And Industrial [Member]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts		1	2	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 8,000	$ 273,000	$ 55
Real Estate Construction Porfolio Segment [Member]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			1	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			$ 58,000	$ 152
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts		1		1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 8,000		$ 8
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			$ 270,000

X

- 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=66008989&loc=SL6953682-111524

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X

- Definition

Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, 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=66008989&loc=SL6953682-111524

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