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Note 7 - Business Segment Information (Details) - subsidiary | Jul. 01, 2018 | Jun. 30, 2018
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BUSINESS SEGMENT INFORMATION |  |
Number of subsidiaries commercial banks | 5 | 4

X
- Definition Represents the number of subsidiaries. + References No definition available. + Details
Name: | qcrh_NumberOfSubsidiaries
Namespace Prefix: | qcrh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration