Note 4 - Loans and Allowance for Loan Losses (Details Textual) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Allowance for Loan and Lease Losses, Period Increase (Decrease)	$ (79)	$ (1,167)	$ (135)	$ (1,119)	$ (1,112)
Allowance for Loan and Lease Losses, Write-offs			$ 313	0	11
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment				$ 238
Minimum Loan Balance For Loans Evaluated by Risk Categories	500		$ 500
Impaired Financing Receivable, Related Allowance	98		98		2,981
Loans and Leases Receivable, Impaired, Commitment to Lend	$ 2,271		$ 2,271		$ 2,427
Financing Receivable, Modifications, Number of Contracts	3	0	3
Troubled Debt Restructurings [Member]
Increase (Decrease) in Other Loans			$ 326
Change In Troubled Debt Restructurings			2.00%
Percentage of Loan Portfolio	85.00%		85.00%		82.00%
Impaired Financing Receivable, Related Allowance	$ 98		$ 98		$ 546
Unsecured [Member]
Percentage of Loan Portfolio	5.12%		5.12%		5.61%
Residential Portfolio Segment [Member]
Real Estate Acquired Through Foreclosure	$ 564		$ 564		$ 938
Mortgage Loans in Process of Foreclosure, Amount	$ 1,812		$ 1,812		$ 1,492
Financing Receivable, Modifications, Number of Contracts	1		1

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

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- Definition

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

+ References

No definition available.

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- Definition

The percentage of the loan portfolio.

+ References

No definition available.

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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))
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- Definition

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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- Definition

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 investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

+ References

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- Definition

Amount of allowance for credit losses related to recorded investment.

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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- Definition

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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