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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parentheticals) - $ / shares | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Retained Earnings [Member] |  |
Cash dividends on common stock, per share (in dollars per share) | $ 0.15 | $ 0.14
Common Stock [Member] |  |
Issuance of common stock, dividend reinvestment plan, shares (in shares) | 2,216 | 2,757
Issuance of common stock, stock incentive plan, shares (in shares) | 21,302 | 27,134
First National Corporation 2014 Stock Incentive Plan [Member] |  |
Repurchase of common stock shares (in shares) | 6,495 | 8,283
Stock Repurchase Plan [Member] |  |
Repurchase of common stock shares (in shares) | 1,557 |

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