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Note 5 - Fair Value - Quantitative Information About Level Fair Value Measurements (Details) - Fair Value, Measurements, Nonrecurring [Member] | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | ---
Impaired loans/leases | $ 5,564,760 | $ 8,972,337
OREO | $ 13,770,025 | $ 14,642,973
Minimum [Member] | Measurement Input, Appraisal Adjustment Rate [Member] |  |
Impaired loans/leases, measurment input | (10) |
OREO, measurment input | 0 |
Maximum [Member] | Measurement Input, Appraisal Adjustment Rate [Member] |  |
Impaired loans/leases, measurment input | (30) |
OREO, measurment input | (35) |

X
- Definition The fair value of impaired loans. + References No definition available. + Details
Name: | qcrh_ImpairedLoansFairValue
Namespace Prefix: | qcrh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The measurement input for impaired loans. + References No definition available. + Details
Name: | qcrh_ImpairedLoansMeasurementInput
Namespace Prefix: | qcrh_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition The fair value of other real estate owned. + References No definition available. + Details
Name: | qcrh_OtherRealEstateOwnedFairValue
Namespace Prefix: | qcrh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Value of input used to measure real estate owned by financial institution by financial institution which is not directly related to its business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_OtherRealEstateOwnedMeasurementInput
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MeasurementInputTypeAxis=qcrh_MeasurementInputAppraisalAdjustmentRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |