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Note 6 - Fair Value - Quantitative Information About Level Fair Value Measurements (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015
Impaired Loans Leases [Member] | Minimum [Member] |  |
Appraisal adjustments | (10.00%) |
Impaired Loans Leases [Member] | Maximum [Member] |  |
Appraisal adjustments | (50.00%) |
Impaired Loans Leases [Member] |  |
Fair value | $ 7,870,032 | $ 4,545,966
Valuation technique | Appraisal of collateral |
Other Securities [Member] | Minimum [Member] |  |
Appraisal adjustments | 0.00% |
Other Securities [Member] | Maximum [Member] |  |
Appraisal adjustments | (35.00%) |
Other Securities [Member] |  |
Fair value | $ 6,272,211 | 7,722,711
Valuation technique | Appraisal of collateral |
Fair value | $ 14,142,243 | $ 12,268,677

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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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- 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=66048111&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueInputsComparabilityAdjustments
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- 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=66048111&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementsValuationTechniques
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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