Note 5 - Supplemental Disclosure for Earnings Per Share - Supplemental Disclosure for Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net income attributable to First Capital, Inc.	$ 2,860	$ 2,100	$ 5,007	$ 4,233
Weighted average common shares outstanding (in shares)	3,329,837	3,326,797	3,329,840	3,326,632
Net income attributable to First Capital, Inc. per common share, basic (in dollars per share)	$ 0.86	$ 0.63	$ 1.50	$ 1.27
Weighted average common shares outstanding (in shares)	3,329,837	3,326,797	3,329,840	3,326,632
Add: Dilutive effect of restricted stock (in shares)	11,976	7,041	11,110	6,401
Weighted average common shares outstanding, as adjusted (in shares)	3,341,813	3,333,838	3,340,950	3,333,033
Net income attributable to First Capital, Inc. per common share, diluted (in dollars per share)	$ 0.86	$ 0.63	$ 1.50	$ 1.27