Note 26 - Selected Quarterly Financial Information (Unaudited) - Selected Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Interest income	$ 6,244	$ 6,215	$ 6,289	$ 6,346	$ 5,109	$ 4,553	$ 4,555	$ 4,496	$ 25,094	$ 18,713
Interest expense	393	414	456	500	302	220	239	243	1,763	1,004
Net interest income	5,851	5,801	5,833	5,846	4,807	4,333	4,316	4,253	23,331	17,709
Provision for loan losses	220	200	150	75	0	0	50	0	645	50
Net interest income after provision for loan losses	5,631	5,601	5,683	5,771	4,807	4,333	4,266	4,253	22,686	17,659
Noninterest income	1,436	1,750	1,615	1,368	1,320	1,226	1,214	1,364	6,169	5,124
Noninterest expenses	4,697	4,924	4,844	4,990	4,517	3,651	3,761	3,679	19,455	15,608
Income before income taxes	2,370	2,427	2,454	2,149	1,610	1,908	1,719	1,938	9,400	7,175
Income tax expense	626	666	667	564	501	507	487	469	2,523	1,964
Net income	1,744	1,761	1,787	1,585	1,109	1,401	1,232	1,469	6,877	5,211
Less net income attributable to the noncontrolling interest in subsidiary	3	3	4	3	3	3	4	3	13	13
Net income attributable to First Capital, Inc.	$ 1,741	$ 1,758	$ 1,783	$ 1,582	$ 1,106	$ 1,398	$ 1,228	$ 1,466	$ 6,864	$ 5,198
Basic (in dollars per share)	$ 0.52	$ 0.53	$ 0.53	$ 0.47	$ 0.38	$ 0.51	$ 0.45	$ 0.53	$ 2.05	$ 1.87
Diluted (in dollars per share)	$ 0.52	$ 0.53	$ 0.53	$ 0.47	$ 0.38	$ 0.51	$ 0.45	$ 0.53	$ 2.05	$ 1.87