Note 4 - Supplemental Disclosure for Earnings Per Share - Supplemental Disclosure for Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net income attributable to First Capital, Inc.	$ 1,553	$ 1,582
Weighted average common shares outstanding (in shares)	3,342,052	3,339,103
Net income attributable to First Capital, Inc. per common share, basic (in dollars per share)	$ 0.46	$ 0.47
Add: Dilutive effect of restricted stock (in shares)	5,070	2,180
Weighted average common shares outstanding, as adjusted (in shares)	3,347,122	3,341,283
Net income attributable to First Capital, Inc. per common share, diluted (in dollars per share)	$ 0.46	$ 0.47