Note 15 - Fair Value of Financial Instruments - Schedule of Estimated Fair Value and Related Carrying or Notional Amounts of Company's Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Investment securities available-for-sale, at fair value	$ 183,858	$ 181,910
Investment securities held-to-maturity	29,358	25,508
Reported Value Measurement [Member]
Cash and cash equivalents	32,905	23,530
Investment securities available-for-sale, at fair value	183,858	181,910
Investment securities held-to-maturity	29,639	25,904
Federal Home Loan Bank stock	1,609	1,581
Loans, net of allowance for loan losses	317,677	322,772
Other assets – derivatives	358	346
Deposits	509,078	497,556
Short-term borrowings	10,750	10,119
Long-term debt	15,000	15,000
Deposits	509,078	497,556
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	32,905	23,530
Investment securities available-for-sale, at fair value	183,858	181,910
Investment securities held-to-maturity	29,357	25,508
Federal Home Loan Bank stock	1,609	1,581
Loans, net of allowance for loan losses	313,079	319,881
Other assets – derivatives	358	346
Deposits	508,634	497,037
Short-term borrowings	10,750	10,119
Long-term debt	15,001	14,998
Deposits	508,634	497,037
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	32,905	23,530
Investment securities available-for-sale, at fair value
Investment securities held-to-maturity
Federal Home Loan Bank stock
Loans, net of allowance for loan losses
Other assets – derivatives
Deposits
Short-term borrowings
Long-term debt
Deposits
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents
Investment securities available-for-sale, at fair value	183,858	181,910
Investment securities held-to-maturity	29,357	25,508
Federal Home Loan Bank stock
Loans, net of allowance for loan losses
Other assets – derivatives	358	346
Deposits	508,634	497,037
Short-term borrowings	10,750	10,119
Long-term debt	15,001	14,998
Deposits	508,634	497,037
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents
Investment securities available-for-sale, at fair value
Investment securities held-to-maturity
Federal Home Loan Bank stock	1,609	1,581
Loans, net of allowance for loan losses	313,079	319,881
Other assets – derivatives
Deposits
Short-term borrowings
Long-term debt
Deposits

Amount of debt securities categorized neither as held-to-maturity nor trading.

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)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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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.

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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.

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No definition available.

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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

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- Definition

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

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

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

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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
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-URI http://asc.fasb.org/subtopic&trid=2196772

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date.

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