Note 12 - Junior Subordinated Debentures - Junior Subordinated Debentures (Details) - USD ($)		Dec. 31, 2016	Dec. 31, 2015
Junior subordinated debentures		$ 33,480,202	$ 38,499,052
Junior subordinated debentures	[1]	(2,089,798)	(2,225,948)
Note Payable to QCR Holdings Capital Trust II [Member]
Junior subordinated debentures		10,310,000	10,310,000
Note Payable to Trust III [Member]
Junior subordinated debentures		8,248,000	8,248,000
Note Payable to Trust IV [Member]
Junior subordinated debentures			5,155,000
Note Payable to Trust V [Member]
Junior subordinated debentures		10,310,000	10,310,000
Community National Trust II [Member]
Junior subordinated debentures		3,093,000	3,093,000
Community National Trust III [Member]
Junior subordinated debentures		$ 3,609,000	$ 3,609,000

[1] Discount on junior subordinated debt acquired in 2013 as part of the purchase of Community National