Note 8 - Revenue Recognition (Details Textual)	3 Months Ended
Mar. 31, 2018
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