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Note 18 - Dividend Reinvestment Plan (Details Textual) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Quoted Prices Preceding Dividend Payment Date Period	10 days
Stock Issued During Period, Shares, Dividend Reinvestment Plan	5,671	3,148

X

- Definition

Number of consecutive trading days for purchase of common share.

+ References

No definition available.

+ Details

Name:	fxnc_QuotedPricesPrecedingDividendPaymentDatePeriod
Namespace Prefix:	fxnc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- 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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration