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Note 22 - Stock Compensation Plans (Details Textual) - USD ($) $ in Thousands				12 Months Ended
	Oct. 13, 2021	Jul. 01, 2021	Feb. 23, 2021	Dec. 31, 2021	Dec. 31, 2020	May 13, 2014
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	7,000	3,000	13,094	23,094
Share-based Payment Arrangement, Expense				$ 226	$ 240
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		2 years
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount				$ 236
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)				2 years
Restricted Stock Units (RSUs) [Member] | Vesting Immediately [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)			2,026
Restricted Stock Units (RSUs) [Member] | Vesting One Half Each Year for Two Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)			4,040
Restricted Stock Units (RSUs) [Member] | Vesting on Fifth Anniversary of Grant Date [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	6,000		7,028
Restricted Stock Units (RSUs) [Member] | Vesting on February 23 Each Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		1,500
Restricted Stock Units (RSUs) [Member] | Vesting on Third Anniversary of Grant Date [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	1,000
Board of Directors [Member] | Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)				6,000
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares)				6,000
Share-based Payment Arrangement, Expense				$ 127	$ 50
First National Corporation 2014 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)						240,000

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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