Note 6 - Supplemental Disclosure for Earnings Per Share - Supplemental Disclosure for Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Net income attributable to First Capital, Inc.	$ 3,816	$ 2,527
Weighted average common shares outstanding (in shares)	3,353,623	3,350,745
Net income attributable to First Capital, Inc. per common share, basic (in dollars per share)	$ 1.14	$ 0.75
Net income attributable to First Capital, Inc.	$ 3,816	$ 2,527
Weighted average common shares outstanding (in shares)	3,353,623	3,350,745
Add: Dilutive effect of restricted stock (in shares)	0	0
Weighted average common shares outstanding, as adjusted (in shares)	3,353,623	3,350,745
Net income attributable to First Capital, Inc. per common share, diluted (in dollars per share)	$ 1.14	$ 0.75