Note 7 - Fair Value Measurements - Carrying Value and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Securities available for sale	$ 272,185	$ 255,844
Securities held to maturity	2	2
Reported Value Measurement [Member]
Cash and cash equivalents	47,657	45,835
Interest-bearing time deposits	13,535	14,735
Securities available for sale	272,185	255,844
Securities held to maturity	2	2
Loans held for sale	2,425	4,507
Loans, net	385,084	381,154
FHLB and other stock	1,650	1,650
Accrued interest receivable	2,437	2,363
Deposits	681,659	664,650
Accrued interest payable	122	133
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	47,657	45,835
Interest-bearing time deposits	13,556	14,786
Securities available for sale	272,185	255,844
Securities held to maturity	2	2
Loans held for sale	2,473	4,598
Loans, net	384,278	381,459
FHLB and other stock	1,650	1,650
Accrued interest receivable	2,437	2,363
Deposits	680,685	663,806
Accrued interest payable	122	133
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	47,657	45,835
Interest-bearing time deposits	0	0
Securities available for sale	73	74
Securities held to maturity	0	0
Loans held for sale	0	0
Loans, net	0	0
FHLB and other stock	0	0
Accrued interest receivable	0	0
Deposits	0	0
Accrued interest payable	0	0
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	0	0
Interest-bearing time deposits	13,556	14,786
Securities available for sale	272,112	255,770
Securities held to maturity	2	2
Loans held for sale	2,473	4,598
Loans, net	0	0
FHLB and other stock	1,650	1,650
Accrued interest receivable	2,437	2,363
Deposits	0	0
Accrued interest payable	122	133
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents	0	0
Interest-bearing time deposits	0	0
Securities available for sale	0	0
Securities held to maturity	0	0
Loans held for sale	0	0
Loans, net	384,278	381,459
FHLB and other stock	0	0
Accrued interest receivable	0	0
Deposits	680,685	663,806
Accrued interest payable	$ 0	$ 0

Represents the fair value of accrued interest receivable.

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Represents the fair value of interest payable.

+ References

No definition available.

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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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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
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-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562

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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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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.

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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

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

+ References

No definition available.

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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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