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Note 13 - Stock Compensation Plans (Details Textual) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) shares | Mar. 31, 2020 shares | Sep. 30, 2020 USD ($) shares | Sep. 30, 2019 USD ($) | May 13, 2014 shares
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-based Payment Arrangement, Expense | $ |  |  | $ 204 | $ 92 |
Restricted Stock, Vested, Conversion Ratio |  |  | 1 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 14,457 | 14,457 |  |
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | $ | $ 213 |  | $ 213 |  |
Restricted Stock Units (RSUs) [Member] | Vesting Immediately [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 4,825 |  |  |
Restricted Stock Units (RSUs) [Member] | Vesting One Half Each Year for Two Years [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 9,632 |  |  |
Board of Directors [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 3,500 |  |  |  |
Share-based Payment Arrangement, Expense | $ |  |  | $ 50 | $ 67 |
First National Corporation 2014 Stock Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  |  | 240,000

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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