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Note 9 - Short-term Borrowings - Overnight Repurchase Agreements (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Repurchase Agreements with Customers [Member] |  |
Average daily balance during the period | $ 7,830,860 | $ 7,475,824
Average daily interest rate during the period | 0.38% | 0.08%
Maximum month-end balance during the period | $ 10,391,529 | $ 11,829,201
Weighted average rate as of end of period | 0.90% | 0.15%
Federal Funds Purchased [Member] |  |
Average daily balance during the period | $ 13,059,102 | $ 13,486,239
Average daily interest rate during the period | 2.18% | 1.31%
Maximum month-end balance during the period | $ 32,330,000 | $ 33,650,000
Weighted average rate as of end of period | 2.46% | 1.24%

X
- Definition Represents the average daily balance during the period. + References No definition available. + Details
Name: | qcrh_AverageDailyBalanceDuringThePeriod
Namespace Prefix: | qcrh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the average daily interest rate during the period. + References No definition available. + Details
Name: | qcrh_AverageDailyInterestRateDuringThePeriod
Namespace Prefix: | qcrh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents information about the maximum month end balance during the period. + References No definition available. + Details
Name: | qcrh_MaximumMonthEndBalanceDuringThePeriod
Namespace Prefix: | qcrh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
Name: | us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentAxis=qcrh_RepurchaseAgreementsWithCustomersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=us-gaap_FederalFundsPurchasedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |