Note 9 - Junior Subordinate Debentures (Detail)	3 Months Ended		3 Months Ended
Mar. 31, 2011 QCR Holdings Statutory Trust II [Member]	Dec. 31, 2011 QCR Holdings Statutory Trust II [Member]	Apr. 07, 2011 QCR Holdings Statutory Trust V [Member]	Dec. 31, 2011 QCR Holdings Statutory Trust V [Member]
Subordinated Borrowing, Interest Rate	6.93%		6.62%
Debt Instrument, Basis Spread on Variable Rate		2.85%		1.55%

Stated interest rate of the subordinated debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-BRD

-Paragraph 80

-Subparagraph Exhibit 4-8, 9

-IssueDate 2006-05-01

-Chapter 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-BRD

-Paragraph 08

-IssueDate 2006-05-01

-Chapter 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_SubordinatedBorrowingInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration