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Note 7 - Loans and Related Allowance for Loan Losses - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)
Commercial And Industrial [Member]
Number of contracts	1	2
Pre-modification outstanding recorded investment	$ 50	$ 33
Post-modification outstanding recorded investment	$ 50	$ 33
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Number of contracts	2	2
Pre-modification outstanding recorded investment	$ 36	$ 74
Post-modification outstanding recorded investment	$ 36	$ 74
Commercial Real Estate Portfolio Segment [Member]
Number of contracts		2
Pre-modification outstanding recorded investment		$ 581
Post-modification outstanding recorded investment		$ 581
Extended Maturity [Member] | Commercial And Industrial [Member]
Number of contracts	1	2
Extended Maturity [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Number of contracts	2	2
Extended Maturity [Member] | Commercial Real Estate Portfolio Segment [Member]
Number of contracts		2
Other Restructurings [Member] | Commercial And Industrial [Member]
Number of contracts
Other Restructurings [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Number of contracts
Other Restructurings [Member] | Commercial Real Estate Portfolio Segment [Member]
Number of contracts

X

- 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=84173941&loc=SL6953676-111524

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X

- Definition

Post-modification amount of investment in financing receivables 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=84173941&loc=SL6953676-111524

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X

- Definition

Pre-modification amount of investment in financing receivables 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=84173941&loc=SL6953676-111524

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X

- Details

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- Details

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Namespace Prefix:
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X

- Details

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