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Note 8 - Business Segment Information (Details) - subsidiary	Sep. 30, 2018	Jul. 01, 2018
BUSINESS SEGMENT INFORMATION
Number of subsidiaries commercial banks	5	5

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