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Note 4 - Loans and Allowance for Loan Losses (Details Textual)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Residential Portfolio Segment [Member]
Real Estate Acquired Through Foreclosure	$ 818,000		$ 818,000		$ 1,131,000
Mortgage Loans in Process of Foreclosure, Amount	1,099,000		$ 1,099,000		988,000
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]
Financing Receivable, Modifications, Number of Contracts			2
Impaired Financing Receivable, Related Allowance	$ 104,000		$ 104,000		107,000
Specific Reserves [Member]
Allowance for Loan and Lease Losses, Write-offs					$ 1,304,000
Troubled Debt Restructurings [Member]
Increase (Decrease) in Other Loans			$ 725,000
Change In Troubled Debt Restructurings			4.50%
Percentage of Loan Portfolio	83.00%		83.00%		81.00%
Impaired Financing Receivable, Related Allowance	$ 550,000		$ 550,000		$ 1,669,000
Unsecured [Member]
Percentage of Loan Portfolio	5.53%		5.53%		6.06%
Allowance for Loan and Lease Losses, Period Increase (Decrease)	$ (1,167,000)	$ (47,000)	$ (1,119,000)	$ 68,000	$ 93,000
Allowance for Loan and Lease Losses, Write-offs	0	$ 1,304,000	0	$ 1,304,000	1,422,000
Impaired Financing Receivable, Related Allowance	2,630,000		2,630,000		2,164,000
Loans and Leases Receivable, Impaired, Commitment to Lend	864,000		864,000		$ 995,000
Minimum Loan Balance For Loans Evaluated by Risk Categories	$ 500,000		$ 500,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			0		0

X

- Definition

The change during the period in loans modified as troubled debt restructurings.

+ References

No definition available.

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Minimum loan balance for impaired loans on nonaccrual status or nonperforming in nature.

+ References

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- Definition

The percentage of the loan portfolio.

+ References

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- Definition

Amount of increase (decrease) of allowance reserve for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(3)
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Number of financing receivables that have been modified by troubled debt restructurings.

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- 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.

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- Definition

Amount of allowance for credit losses related to recorded investment.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Amount of increase (decrease) in loans classified as other.

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Reflects the unfunded portion of contractual agreements to lend funds to borrowers for loans whose terms have been modified by troubled debt restructuring.

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- Definition

Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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