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Note 13 - COMMITMENTS (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
CSB facility |  |
COMMITMENTS |  |
Contract price for construction of new facility |  | $ 41.3
Construction payment for new facility | $ 28.7 |
Construction remaining future commitment | 12.6 |
New company and QCBT facility |  |
COMMITMENTS |  |
Contract price for construction of new facility | 66.5 |
Construction payment for new facility | 2.7 |
Construction remaining future commitment | $ 63.8 |

X
- Definition The amount of contract price that was paid. + References No definition available. + Details
Name: | qcrh_ConstructionCommitmentPaymentMade
Namespace Prefix: | qcrh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of contract price remaining for future payment consisting of work plus fee payable under construction commitment. + References No definition available. + Details
Name: | qcrh_ConstructionCommitmentRemainingFutureCommitment
Namespace Prefix: | qcrh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=qcrh_CsbFacilityInAnkenyIowaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=qcrh_NewCompanyAndQcbtFacilityInBettendorfIowaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |