Note 5 - Supplemental Disclosure for Earnings Per Share - Supplemental Disclosure for Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Net income attributable to First Capital, Inc.	$ 2,527	$ 2,939
Weighted average common shares outstanding (in shares)	3,350,745	3,342,492
Net income attributable to First Capital, Inc. per common share, basic (in dollars per share)	$ 0.75	$ 0.88
Net income attributable to First Capital, Inc.	$ 2,527	$ 2,939
Weighted average common shares outstanding (in shares)	3,350,745	3,342,492
Add: Dilutive effect of restricted stock (in shares)	0	5,275
Weighted average common shares outstanding, as adjusted (in shares)	3,350,745	3,347,767
Net income attributable to First Capital, Inc. per common share, diluted (in dollars per share)	$ 0.75	$ 0.88