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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parentheticals) - $ / shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
First National Corporation 2014 Stock Incentive Plan [Member]
Repurchase of common stock shares (in shares)	2,223	1,006
Stock Repurchase Plan [Member]
Repurchase of common stock shares (in shares)	129,035
Cash dividends on common stock, per share (in dollars per share)	$ 0.11	$ 0.09
Issuance of common stock, dividend reinvestment plan, shares (in shares)	2,242	1,397
Issuance of common stock, stock incentive plan, shares (in shares)	8,992	5,402

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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