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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parentheticals) - $ / shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Retained Earnings [Member] |  |  |  |
Cash dividends on common stock, per share (in dollars per share) | $ 0.15 | $ 0.14 | $ 0.45 | $ 0.42
Common Stock [Member] |  |  |  |
Issuance of common stock, dividend reinvestment plan, shares (in shares) | 2,295 | 2,733 | 7,047 | 7,853
Issuance of common stock, stock incentive plan, shares (in shares) |  |  | 33,002 | 34,634
Stock Repurchase Plan [Member] |  |  |  |
Repurchase of common stock shares (in shares) | 3,674 |  |  |
First National Corporation 2014 Stock Incentive Plan [Member] |  |  |  |
Repurchase of common stock shares (in shares) |  |  | 6,495 | 8,283
Issuance of common stock, stock incentive plan, shares (in shares) | 6,495 | 7,500 |  |
Repurchase of common stock shares (in shares) |  |  | 37,532 |

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