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Note 15 - Stock-Based Compensation (Details) - Stock-based Compensation Expense (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 891,619 us-gaap_AllocatedShareBasedCompensationExpense | $ 792,279 us-gaap_AllocatedShareBasedCompensationExpense | $ 849,760 us-gaap_AllocatedShareBasedCompensationExpense
Stock Option and Incentive Plans [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | 832,845 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = qcrh_StockOptionAndIncentivePlansMember | 734,827 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = qcrh_StockOptionAndIncentivePlansMember | 798,929 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = qcrh_StockOptionAndIncentivePlansMember
Employee Stock Purchase Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 58,774 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = qcrh_EmployeeStockPurchasePlanMember | $ 57,452 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = qcrh_EmployeeStockPurchasePlanMember | $ 50,831 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = qcrh_EmployeeStockPurchasePlanMember

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |