Note 4 - 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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net income attributable to First Capital, Inc. per common share, basic (in dollars per share)	$ 0.66	$ 0.53	$ 1.13	$ 1.01
Net income attributable to First Capital, Inc.	$ 2,190	$ 1,783	$ 3,743	$ 3,365
Weighted average common shares outstanding (in shares)	3,323,552	3,339,063	3,323,552	3,339,082
Add: Dilutive effect of restricted stock (in shares)	5,488	2,244	5,286	1,536
Weighted average common shares outstanding, as adjusted (in shares)	3,329,040	3,341,307	3,328,838	3,340,618
Net income attributable to First Capital, Inc. per common share, diluted (in dollars per share)	$ 0.66	$ 0.53	$ 1.12	$ 1.01