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Note 16 - Fair Value of Financial Instruments - Estimated Fair Value and Related Carrying or Notional Amounts of Financial Instruments (Details) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018
--- | --- | --- | ---
Assets: |  |  |
Investment securities available-for-sale | $ 127,185,000 | $ 132,487,000 |
Investment securities held-to-maturity | 20,467,000 | 20,852,000 | $ 20,467,000
Reported Value Measurement [Member] |  |  |
Assets: |  |  |
Cash and cash equivalents | 60,046,000 | 49,599,000 |
Investment securities available-for-sale | 127,185,000 | 132,487,000 |
Investment securities held-to-maturity | 20,840,000 | 21,462,000 |
Federal funds sold | 15,080,000 | 8,354,000 |
Federal Home Loan Bank stock | 713,000 | 703,000 |
Loans, net of allowance for loan and lease losses | 502,760,000 | 514,867 |
Liabilities: |  |  |
Deposits | 703,361,000 | 704,725,000 |
Short-term borrowings |  | 527,000 |
Estimate of Fair Value Measurement [Member] |  |  |
Assets: |  |  |
Cash and cash equivalents | 60,046,000 | 49,599,000 |
Investment securities available-for-sale | 127,185,000 | 132,487,000 |
Investment securities held-to-maturity | 20,467,000 | 20,852,000 |
Federal funds sold | 15,080,000 | 8,354,000 |
Federal Home Loan Bank stock | 713,000 | 703,000 |
Loans, net of allowance for loan and lease losses | 512,378,000 | 516,420 |
Liabilities: |  |  |
Deposits | 702,185,000 | 702,832,000 |
Short-term borrowings |  | 527,000 |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Assets: |  |  |
Cash and cash equivalents | 60,046,000 | 49,599,000 |
Investment securities available-for-sale |  |  |
Investment securities held-to-maturity |  |  |
Federal funds sold |  |  |
Federal Home Loan Bank stock |  |  |
Loans, net of allowance for loan and lease losses |  |  |
Liabilities: |  |  |
Deposits |  |  |
Short-term borrowings |  |  |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Assets: |  |  |
Cash and cash equivalents |  |  |
Investment securities available-for-sale | 127,185,000 | 132,487,000 |
Investment securities held-to-maturity | 20,467,000 | 20,852,000 |
Federal funds sold | 15,080,000 | 8,354,000 |
Federal Home Loan Bank stock |  |  |
Loans, net of allowance for loan and lease losses |  |  |
Liabilities: |  |  |
Deposits | 702,185,000 | 702,832,000 |
Short-term borrowings |  | 527,000 |
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Assets: |  |  |
Cash and cash equivalents |  |  |
Investment securities available-for-sale |  |  |
Investment securities held-to-maturity |  |  |
Federal funds sold |  |  |
Federal Home Loan Bank stock | 713,000 | 703,000 |
Loans, net of allowance for loan and lease losses | 512,378,000 | 516,420 |
Liabilities: |  |  |
Deposits |  |  |
Short-term borrowings |  |  |

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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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. + Details
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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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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
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- Definition Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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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. + References No definition available. + Details
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