Note 11 - Junior Subordinate Debentures (Details) - Trust Preferred Securities (Trust Preferred Securities [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Investments in and Advances to Affiliates [Line Items]
Amount Issued (in Dollars)	$ 42,787,000
Interest rate	2.50%	2.51%
London Interbank Offered Rate (LIBOR) [Member] | QCR Holdings Statutory Trust II [Member]
Investments in and Advances to Affiliates [Line Items]
Interest rate description	2.85%
London Interbank Offered Rate (LIBOR) [Member] | QCR Holdings Statutory Trust III [Member]
Investments in and Advances to Affiliates [Line Items]
Interest rate description	2.85%
London Interbank Offered Rate (LIBOR) [Member] | QCR Holdings Statutory Trust IV [Member]
Investments in and Advances to Affiliates [Line Items]
Interest rate description	1.80%
London Interbank Offered Rate (LIBOR) [Member] | QCR Holdings Statutory Trust V [Member]
Investments in and Advances to Affiliates [Line Items]
Interest rate description	1.55%
London Interbank Offered Rate (LIBOR) [Member] | Community National Trust II [Member]
Investments in and Advances to Affiliates [Line Items]
Interest rate description	2.17%
London Interbank Offered Rate (LIBOR) [Member] | Community National Trust III [Member]
Investments in and Advances to Affiliates [Line Items]
Interest rate description	1.75%
QCR Holdings Statutory Trust II [Member]
Investments in and Advances to Affiliates [Line Items]
Date issued	February 2004
Amount Issued (in Dollars)	12,372,000
Interest rate	3.08%	3.10%
QCR Holdings Statutory Trust III [Member]
Investments in and Advances to Affiliates [Line Items]
Date issued	February 2004
Amount Issued (in Dollars)	8,248,000
Interest rate	3.08%	3.10%
QCR Holdings Statutory Trust IV [Member]
Investments in and Advances to Affiliates [Line Items]
Date issued	May 2005
Amount Issued (in Dollars)	5,155,000
Interest rate	2.03%	2.04%
QCR Holdings Statutory Trust V [Member]
Investments in and Advances to Affiliates [Line Items]
Date issued	February 2006
Amount Issued (in Dollars)	10,310,000
Interest rate	1.78%	1.79%
Community National Trust II [Member]
Investments in and Advances to Affiliates [Line Items]
Date issued	September 2004
Amount Issued (in Dollars)	3,093,000
Interest rate	2.42%	2.42%
Community National Trust III [Member]
Investments in and Advances to Affiliates [Line Items]
Date issued	March 2007
Amount Issued (in Dollars)	$ 3,609,000
Interest rate	1.99%	1.99%