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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parentheticals) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Retained Earnings [Member]
Cash dividends on common stock, per share (in dollars per share)	$ 0.12	$ 0.11	$ 0.24	$ 0.22
Common Stock [Member] | First National Corporation 2014 Stock Incentive Plan [Member]
Repurchase of common stock shares (in shares)			2,221	2,223
Common Stock [Member] | Stock Repurchase Plan [Member]
Repurchase of common stock shares (in shares)				129,035
Common Stock [Member]
Issuance of common stock, dividend reinvestment plan, shares (in shares)	1,997	2,495	4,208	4,737
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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-Publisher FASB
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- Definition

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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