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Note 14 - Employee Benefit Plans - Profit Sharing Contributions (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Matching contribution | $ 1,663,198 | $ 1,365,111 | $ 1,314,276
| $ 1,663,198 | $ 1,365,111 | $ 1,314,276

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- Definition Defined contribution plan matching contribution. + References No definition available. + Details
Name: | qcrh_DefinedContributionPlanMatchingContribution
Namespace Prefix: | qcrh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of payment for pension benefits. Excludes other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
Name: | us-gaap_PensionContributions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration