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Note 8 - Revenue Recognition (Details Textual) | 3 Months Ended
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Mar. 31, 2018
Percent of Revenue not Subject to New Accounting Policy | 89.00%

X
- Definition The percent of the companies revenue that is not subject to certain new accounting policies. + References No definition available. + Details
Name: | qcrh_PercentOfRevenueNotSubjectToNewAccountingPolicy
Namespace Prefix: | qcrh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration