Note 21 - Disclosures About Fair Value of Financial Instruments - Carrying Value and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financial assets:
Securities available for sale, at fair value	$ 271,172	$ 255,770
Securities held to maturity	1	2
Reported Value Measurement [Member]
Financial assets:
Cash and cash equivalents	25,915	45,909
Interest-bearing time deposits	9,258	14,735
Securities available for sale, at fair value	271,172	255,770
Securities held to maturity	1	2
Loans held for sale	2,630	4,507
Loans, net	409,618	381,154
FHLB and other stock	1,979	1,650
Accrued interest receivable	2,694	2,363
FHLB and other stock	1,979	1,650
Financial liabilities:
Deposits	664,562	664,650
FHLB advances	10,000
Accrued interest payable	107	133
Estimate of Fair Value Measurement [Member]
Financial assets:
Cash and cash equivalents	25,915	45,909
Interest-bearing time deposits	9,220	14,786
Securities available for sale, at fair value	271,172	255,770
Securities held to maturity	1	2
Loans held for sale	2,678	4,598
Loans, net	404,931	381,459
Accrued interest receivable	2,694	2,363
Financial liabilities:
Deposits	663,006	663,806
FHLB advances	10,000
Accrued interest payable	107	133
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and cash equivalents	25,915	45,909
Interest-bearing time deposits
Securities available for sale, at fair value	271,172
Securities held to maturity
Loans held for sale
Loans, net
Accrued interest receivable
Financial liabilities:
Deposits
FHLB advances
Accrued interest payable
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Financial assets:
Cash and cash equivalents
Interest-bearing time deposits	9,220	14,786
Securities available for sale, at fair value		255,770
Securities held to maturity	1	2
Loans held for sale	2,678	4,598
Loans, net
Accrued interest receivable	2,694	2,363
Financial liabilities:
Deposits
FHLB advances	10,000
Accrued interest payable	107	133
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Financial assets:
Cash and cash equivalents
Interest-bearing time deposits
Securities available for sale, at fair value
Securities held to maturity
Loans held for sale
Loans, net	404,931	381,459
Accrued interest receivable
Financial liabilities:
Deposits	663,006	663,806
FHLB advances
Accrued interest payable

Represents the fair value of accrued interest receivable.

No definition available.

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- Definition

Fair value of Advances from Federal Home Loan Bank (FHLBank).

+ References

No definition available.

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- Definition

Represents the fair value of interest payable.

+ References

No definition available.

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- Definition

Fair value portion of interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.

+ References

No definition available.

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

No definition available.

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- Definition

Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

+ References

No definition available.

+ Details

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- References

No definition available.

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- References

No definition available.

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- Definition

Fair value of investments in debt securities classified as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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- Definition

Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=75030709&loc=d3e39828-111592

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- Definition

Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

+ References

No definition available.

+ Details

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- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2196772

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