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Note 1 - Nature of Business and Significant Accounting Policies (Details) - subsidiary | Jul. 01, 2018 | Jun. 30, 2018
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Summary of Significant Accounting Policies |  |
Number of subsidiaries commercial banks | 5 | 4

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

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