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Note 2 - Fair Value of Financial Instruments - Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Securities available for sale	$ 103,172	$ 96,490
Securities held to maturity	19,376	19,171
Reported Value Measurement [Member]
Cash and cash equivalents	111,917	40,166
Certificates of deposit in financial institutions	1,425	1,670
Securities available for sale	103,172	96,490
Securities held to maturity	18,827	18,665
Restricted investments in bank stocks	7,506	7,506
Loans, net	731,546	727,202
Accrued interest receivable	2,299	2,315
Deposits	867,903	790,452
Other borrowed funds	39,285	37,085
Subordinated debentures	8,500	8,500
Accrued interest payable	543	513
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	111,917	40,166
Certificates of deposit in financial institutions	1,425	1,670
Securities available for sale	103,172	96,490
Securities held to maturity	19,375	19,171
Restricted investments in bank stocks
Loans, net	732,323	727,079
Accrued interest receivable	2,299	2,315
Deposits	868,195	790,916
Other borrowed funds	37,977	35,948
Subordinated debentures	6,141	5,821
Accrued interest payable	543	513
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	111,917	40,166
Certificates of deposit in financial institutions
Securities available for sale
Securities held to maturity
Restricted investments in bank stocks
Loans, net
Accrued interest receivable
Deposits	287,130	209,576
Other borrowed funds
Subordinated debentures
Accrued interest payable	1	4
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents
Certificates of deposit in financial institutions	1,425	1,670
Securities available for sale	103,172	96,490
Securities held to maturity	9,964	9,541
Restricted investments in bank stocks
Loans, net
Accrued interest receivable	365	224
Deposits	581,065	581,340
Other borrowed funds	37,977	35,948
Subordinated debentures	6,141	5,821
Accrued interest payable	542	509
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents
Certificates of deposit in financial institutions
Securities available for sale
Securities held to maturity	9,411	9,630
Restricted investments in bank stocks
Loans, net	732,323	727,079
Accrued interest receivable	1,934	2,091
Deposits
Other borrowed funds
Subordinated debentures
Accrued interest payable

X

- Definition

Fair value portion of a savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References

No definition available.

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- Definition

Fair value portion of Federal Home Loan Bank and Federal Reserve Bank Stock.

+ References

No definition available.

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- Definition

Fair value portion of interest payable on debt, including, but not limited to, trade payables.

+ References

No definition available.

+ Details

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X

- Definition

Fair value portion of of interest earned but not received.

+ References

No definition available.

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X

- Definition

Fair value portion of other miscellaneous borrowings owed by the reporting entity.

+ References

No definition available.

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X

- 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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X

- 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.

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- Definition

Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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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
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-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
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-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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X

- 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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