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Note 7 - Loans and Related Allowance for Loan Losses (Details) - Troubled Debt Restructurings $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts	2	1
Pre-modification outstanding recorded investment	$ 33	$ 48
Post-modification outstanding recorded investment	$ 33	$ 48
Commercial and Industrial [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts	2	1
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts	2	1
Pre-modification outstanding recorded investment	$ 74	$ 175
Post-modification outstanding recorded investment	$ 74	$ 195
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts	2	1
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts		2
Pre-modification outstanding recorded investment		$ 581
Post-modification outstanding recorded investment		$ 581
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts		2

X

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+ References

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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

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=66008989&loc=SL6953676-111524

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- 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=66008989&loc=SL6953676-111524

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