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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parentheticals) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
First National Corporation 2014 Stock Incentive Plan [Member]
Repurchase of common stock shares (in shares)	2,221	2,223
Stock Repurchase Plan [Member]
Repurchase of common stock shares (in shares)		129,035
Cash dividends on common stock, per share (in dollars per share)	$ 0.12	$ 0.11
Issuance of common stock, dividend reinvestment plan, shares (in shares)	2,211	2,242
Issuance of common stock, stock incentive plan (in shares)	8,073	8,992

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

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Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity.

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Number, before forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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