Note 5 - Junior Subordinated Debentures (Details) - Non-Consolidated Subsidiaries (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Interest rate (in Dollars)	$ 42,787,000
Interest rate	2.55%	2.68%
QCR Holdings Capital Trust II [Member]
Debt Instrument [Line Items]
Date issued	Feb. 29, 2004
Interest rate (in Dollars)	12,372,000
Interest rate	3.13%	3.21%
QCR Holdings Capital Trust III [Member]
Debt Instrument [Line Items]
Date issued	Feb. 29, 2004
Interest rate (in Dollars)	8,248,000
Interest rate	3.13%	3.21%
QCR Holdings Capital Trust IV [Member]
Debt Instrument [Line Items]
Date issued	May 31, 2005
Interest rate (in Dollars)	5,155,000
Interest rate	2.08%	2.14%
QCR Holdings Capital Trust V [Member]
Debt Instrument [Line Items]
Date issued	Feb. 28, 2006
Interest rate (in Dollars)	10,310,000
Interest rate	1.83%	1.89%
Community National Trust II [Member]
Debt Instrument [Line Items]
Date issued	Sep. 30, 2004
Interest rate (in Dollars)	3,093,000
Interest rate	2.45%
Community National Trust III [Member]
Debt Instrument [Line Items]
Date issued	Mar. 31, 2007
Interest rate (in Dollars)	$ 3,609,000
Interest rate	2.03%