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Note 20 - Parent Company Only Financial Statements (Details) - Condensed Statements of Cash Flows (Parentheticals) (Series F Noncumulative Perpetual Preferred Stock [Member]) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2012
Condensed Cash Flow Statements, Captions [Line Items] |  |
Redemption of shares of Series F Noncumulative Perpetual Preferred Stock, net | 29,867 us-gaap_StockRedeemedOrCalledDuringPeriodShares | 10,223 us-gaap_StockRedeemedOrCalledDuringPeriodShares
Parent Company [Member] |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |
Redemption of shares of Series F Noncumulative Perpetual Preferred Stock, net | 10,223 us-gaap_StockRedeemedOrCalledDuringPeriodShares / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementClassOfStockAxis = qcrh_SeriesFNoncumulativePerpetualPreferredStockMember |

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- Details
Name: | us-gaap_CondensedCashFlowStatementsCaptionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of stock bought back by the entity at the exercise price or redemption price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
Name: | us-gaap_StockRedeemedOrCalledDuringPeriodShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration