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Note 4 - Loans and Allowance for Loan Losses (Details Textual) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Allowance for Loan and Lease Losses, Period Increase (Decrease)	$ 93	$ 14	$ (42)	$ (1,105)	$ (1,112)
Allowance for Loan and Lease Losses, Write-offs	78	$ 11	391	11	11
Increase (Decrease) in Other Loans			$ 802
Change In Troubled Debt Restructurings			5.00%
Impaired Financing Receivable, Related Allowance	240		$ 240		2,981
Loans and Leases Receivable, Impaired, Commitment to Lend	$ 1,747		$ 1,747		$ 2,427
Financing Receivable, Modifications, Number of Contracts	1	0	4
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment				$ 226
Minimum Loan Balance For Loans Evaluated by Risk Categories	$ 500		$ 500
Troubled Debt Restructurings [Member]
Percentage of Loan Portfolio	86.00%		86.00%		82.00%
Impaired Financing Receivable, Related Allowance	$ 113		$ 113		$ 546
Unsecured [Member]
Percentage of Loan Portfolio	4.92%		4.92%		5.61%
Residential Portfolio Segment [Member]
Real Estate Acquired Through Foreclosure	$ 384		$ 384		$ 938
Mortgage Loans in Process of Foreclosure, Amount	1,979		1,979		$ 1,492
Impaired Financing Receivable, Related Allowance	$ 127		$ 127
Financing Receivable, Modifications, Number of Contracts			1

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- 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.

+ References

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The percentage of the loan portfolio.

+ 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 within the previous 12 months and for which there was a payment default.

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Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, 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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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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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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