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Note 21 - Fair Value (Details) - Quantitative Information About Level Fair Value Measurements (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 26,256,409 us-gaap_AssetsFairValueDisclosureNonrecurring | 19,516,934 us-gaap_AssetsFairValueDisclosureNonrecurring
Impaired Loans/Leases [Member] | Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Appraisal adjustments | 10.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = qcrh_ImpairedLoansLeasesMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 10.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = qcrh_ImpairedLoansLeasesMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Impaired Loans/Leases [Member] | Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Appraisal adjustments | 50.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = qcrh_ImpairedLoansLeasesMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 50.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = qcrh_ImpairedLoansLeasesMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Impaired Loans/Leases [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 12,467,362 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = qcrh_ImpairedLoansLeasesMember | 9,009,557 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = qcrh_ImpairedLoansLeasesMember
Valuation technique | Appraisal of collateral | Appraisal of collateral
Other Real Estate Owned [Member] | Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Appraisal adjustments | 0.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = qcrh_OtherRealEstateOwnedMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 0.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = qcrh_OtherRealEstateOwnedMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Other Real Estate Owned [Member] | Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Appraisal adjustments | 35.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = qcrh_OtherRealEstateOwnedMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 35.00%us-gaap_FairValueInputsComparabilityAdjustments / us-gaap_FairValueByAssetClassAxis = qcrh_OtherRealEstateOwnedMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Other Real Estate Owned [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | 13,789,047 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = qcrh_OtherRealEstateOwnedMember | 10,507,377 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = qcrh_OtherRealEstateOwnedMember
Valuation technique | Appraisal of collateral | Appraisal of collateral

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Percentage of adjustment to the observed price for a similar asset or liability when an identical transaction does not exist, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueInputsComparabilityAdjustments
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Description of the inputs and valuation technique(s) used to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementsValuationTechniques
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=qcrh_ImpairedLoansLeasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=qcrh_OtherRealEstateOwnedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |