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Note 5 - Loans and Allowance for Loan Losses (Details Textual)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Residential Portfolio Segment [Member]
Real Estate Acquired Through Foreclosure	$ 986,000		$ 986,000		$ 1,131,000
Mortgage Loans in Process of Foreclosure, Amount	$ 1,042,000		1,042,000		988,000
Commercial Real Estate Portfolio Segment [Member]
Troubled Debt Restrucuturings Placed on Nonaccrual Status, Number of Contracts	1
Troubled Debt Restrucuturings Placed on Nonaccrual Status, Amount	$ 226,000
Troubled Debt Restrucuturings Placed on Nonaccrual Status, Collateral Impairment	$ 11,000
Specific Reserves [Member]
Allowance for Loan and Lease Losses, Write-offs					$ 1,304,000
Troubled Debt Restructurings [Member]
Increase (Decrease) in Other Loans			$ 869,000
Change In Troubled Debt Restructurings			5.40%
Percentage of Loan Portfolio	82.00%		82.00%		81.00%
Impaired Financing Receivable, Related Allowance	$ 553,000		$ 553,000		$ 1,669,000
Unsecured [Member]
Percentage of Loan Portfolio	5.09%		5.09%		6.06%
Allowance for Loan and Lease Losses, Period Increase (Decrease)	$ 14,000	$ (44,000)	$ (1,105,000)	$ 44	$ 93,000
Allowance for Loan and Lease Losses, Write-offs	11,000	$ 1,422,000	11,000	$ 1,422,000	1,422,000
Impaired Financing Receivable, Related Allowance	2,952,000		2,952,000		2,164,000
Loans and Leases Receivable, Impaired, Commitment to Lend	$ 1,292,000		$ 1,292,000		$ 995,000
Financing Receivable, Modifications, Number of Contracts	0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			0	0
Minimum Loan Balance For Loans Evaluated by Risk Categories	$ 500,000		$ 500,000

X

- Definition

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

+ References

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

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- Definition

The percentage of the loan portfolio.

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Amount of troubled debt restructuring loans that are placed on nonaccrual status during the period.

+ References

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- Definition

Amount of collateral impairment on troubled debt restructuring loans that are placed on nonaccrual status during the period.

+ References

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Number of troubled debt restructuring loans that are placed on nonaccrual status during the period.

+ References

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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Number of financing receivables that have been modified by troubled debt restructurings.

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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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Amount of allowance for credit losses related to recorded investment.

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Amount of increase (decrease) in loans classified as other.

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- Definition

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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Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

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-Publisher FASB
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