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Note 3 - Delinquency Status of Non-accrual Loans and Past Due Matured Loans (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Commercial and Industrial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status
Commercial and Industrial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status
Commercial and Industrial Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	3,158,000
Commercial and Industrial Portfolio Segment [Member] | Non-Accrual Loans [Member]
Non accrual loans current
Commercial and Industrial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	3,158,000
Residential Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Substandard [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status
Residential Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Substandard [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status
Residential Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Substandard [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	1,590,000	$ 1,590,000
Residential Portfolio Segment [Member] | Non-Accrual Loans [Member] | Substandard [Member]
Non accrual loans past due	1,590,000	1,590,000
Non accrual loans current
Residential Portfolio Segment [Member] | Non-Accrual Loans [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		1,590,000
Residential Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	1,590,000	1,590,000
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	1,590,000	1,590,000
Consumer Portfolio Segment [Member] | Non-Accrual Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Substandard [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	3,000	3,000
Consumer Portfolio Segment [Member] | Non-Accrual Loans [Member] | Substandard [Member]
Non accrual loans past due	3,000	3,000
Consumer Portfolio Segment [Member] | Non-Accrual Loans [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	3,000	3,000
Non accrual loans past due	3,158,000
Consumer Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	3,000	3,000
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	3,000	3,000
Non-Accrual Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status
Non-Accrual Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status
Non-Accrual Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	4,751,000	1,593,000
Non-Accrual Loans [Member]
Non accrual loans past due	4,751,000	1,593,000
Non accrual loans current
Substandard [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	4,751,000	1,593,000
Financing Receivable, Recorded Investment, Nonaccrual Status	$ 4,751,000	$ 1,593,000

X

- Definition

Financing receivables that are current.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953401-111524

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5111-111524

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953401-111524

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