Note 9 - Revenue Recognition (Details)	6 Months Ended
Jun. 30, 2018
REVENUE RECOGNITION
Percent of Revenue not Subject to New Accounting Policy	89.00%

The percent of the companies revenue that is not subject to certain new accounting policies.

No definition available.

Name:	qcrh_PercentOfRevenueNotSubjectToNewAccountingPolicy
Namespace Prefix:	qcrh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration