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Note 1 - Nature of Business and Significant Accounting Policies (Details) (USD $) | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jul. 31, 2012 | Sep. 30, 2012 | Aug. 31, 2012 | Aug. 27, 2012 | Aug. 31, 2005 | Oct. 31, 2012
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 2.25%us-gaap_EquityMethodInvestmentOwnershipPercentage |  |  |  |  |  |
Cash and Cash Equivalents, Policy [Policy Text Block] | Presentation of cash flows: For purposes of reporting cash flows, cash and due from banks include cash on hand and noninterest bearing amounts due from banks. Cash flows from federal funds sold, interest bearing deposits at financial institutions, loans/leases, deposits, and short-term and other borrowings are treated as net increases or decreases. Cash and due from banks: The subsidiary banks are required by federal banking regulations to maintain certain cash and due from bank reserves. The reserve requirement was approximately $23,251,000 and $22,435,000 as of December 31, 2014 and 2013, respectively. |  |  |  |  |  |  |  |
Due from Banks (in Dollars) | $ 23,251,000 us-gaap_DueFromBanks | $ 22,435,000 us-gaap_DueFromBanks |  |  |  |  |  |  |
Initial Direct Leasing Costs As a Percentage of Cost | 5.50%qcrh_InitialDirectLeasingCostsAsAPercentageOfCost |  |  |  |  |  |  |  |
Lending Threshold Requiring Additional Loan Review (in Dollars) | 1,000,000 qcrh_LendingThresholdRequiringAdditionalLoanReview |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense (in Dollars) | 891,619 us-gaap_AllocatedShareBasedCompensationExpense | 792,279 us-gaap_AllocatedShareBasedCompensationExpense | 849,760 us-gaap_AllocatedShareBasedCompensationExpense |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars) | 737,464 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 2 years 146 days |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in Shares) | 420,429 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber | 419,735 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber | 391,378 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value (in Dollars) | 2,771,424 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value (in Dollars) | 1,754,995 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value (in Dollars) | $ 173,105 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | $ 268,920 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | $ 56,371 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue |  |  |  |  |  |
New Accounting Pronouncements, Policy [Policy Text Block] | New accounting pronouncements: In January 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. The objective of ASU 2014-04 is to reduce diversity by clarifying when an in substance repossession or foreclosure occurs, that is, when a creditor should be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that the loan receivable should be derecognized and the real estate property recognized. ASU 2014-04 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2014 and is not expected to have a significant impact on the Company’s consolidated financial statements. In May 2014, FASB issued ASU 2014-09, Revenue from Contracts with Customers. ASU 2014-09 implements a common revenue standard that clarifies the principles for recognizing revenue. The core principle of ASU 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve that core principle, an entity should apply the following steps: (i) identify the contract(s) with a customer, (ii) identify the performance obligations in the contract, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations in the contract and (v) recognize revenue when (or as) the entity satisfies a performance obligation. ASU 2014-09 is effective on January 1, 2017 and is not expected to have a significant impact on the Company’s consolidated financial statements. In June 2014, FASB issued ASU 2014-11, Transfers and Servicing. ASU 2014-11 requires that repurchase-to-maturity transactions be accounted for as secured borrowings, consistent with the accounting for other repurchase agreements. In addition, ASU 2014-11 requires separate accounting for repurchase financings, which entail the transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty. The standard requires entities to disclose certain information about transfers accounted for as sales in transactions that are economically similar to repurchase agreements. In addition, ASU 2014-11 requires disclosures related to collateral and remaining tenor and of the potential risks associated with repurchase agreements, securities lending transactions and repurchase-to-maturity transactions. ASU 2014-11 is effective on January 1, 2015 and is not expected to have a significant impact on the Company’s consolidated financial statements. In August 2014, FASB issued ASU 2014-14, Classification of Certain Government-Guaranteed Mortgage Loans Upon Foreclosure. ASU 2014-14 requires creditors to reclassify loans that are within the scope of the ASU to “other receivables” upon foreclosure, rather than reclassifying them as other real estate owned. The most common types of government guaranteed loans include those guaranteed by the Federal Housing Authority (FHA), U.S. Department of Housing and Urban Development (HUD), U.S. Department of Veterans Affairs (VA) and the U.S. Small Business Administration (SBA). The separate other receivable recorded upon foreclosure is to be measured based on the amount of the loan balance (principal and interest) the creditor expects to recover from the guarantor. ASU 2014-14 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2014 and is not expected to have a significant impact on the Company’s consolidated financial statements. |  |  |  |  |  |  |  |
Adjustable Rate Residential Mortgage [Member] | Minimum [Member] | Subsidiaries [Member] |  |  |  |  |  |  |  |  |
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Term | 1 year |  |  |  |  |  |  |  |
Adjustable Rate Residential Mortgage [Member] | Maximum [Member] | Subsidiaries [Member] |  |  |  |  |  |  |  |  |
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Term | 5 years |  |  |  |  |  |  |  |
Fixed Rate Residential Mortgage [Member] | Subsidiaries [Member] |  |  |  |  |  |  |  |  |
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Term | 15 years |  |  |  |  |  |  |  |
Owner-Occupied Commercial Real Estate [Member] |  |  |  |  |  |  |  |  |
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |  |
Commercial Real Estate Owner Occupied, Percentage | 37.00%qcrh_CommercialRealEstateOwnerOccupiedPercentage / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = qcrh_OwnerOccupiedCommercialRealEstateMember | 39.00%qcrh_CommercialRealEstateOwnerOccupiedPercentage / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = qcrh_OwnerOccupiedCommercialRealEstateMember |  |  |  |  |  |  |
In-the-money Options [Member] |  |  |  |  |  |  |  |  |
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in Shares) | 583,466 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardTypeAxis = qcrh_InTheMoneyOptionsMember |  |  |  |  |  |  |  |
Non-Owner Occupied Commercial Real Estate [Member] |  |  |  |  |  |  |  |  |
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |  |
Loan and Leases Recievable, Lending Limits | 300.00%qcrh_LoanAndLeasesRecievableLendingLimits / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = qcrh_NonOwnerOccupiedCommercialRealEstateMember |  |  |  |  |  |  |  |
Commercial Construction, Land Development, and Other Land [Member] |  |  |  |  |  |  |  |  |
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |  |
Loan and Leases Recievable, Lending Limits | 100.00%qcrh_LoanAndLeasesRecievableLendingLimits / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = qcrh_CommercialConstructionLandDevelopmentAndOtherLandMember |  |  |  |  |  |  |  |
m2 Lease Funds LLC [Member] | Quad City Bank and Trust Company [Member] |  |  |  |  |  |  |  |  |
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  | 80.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = qcrh_QuadCityBankAndTrustCompanyMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = qcrh_M2LeaseFundsLLCMember |  |  |  |  |
Velie Plantation Holding Company LLC [Member] |  |  |  |  |  |  |  |  |
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  | 91.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = qcrh_VeliePlantationHoldingCompanyLLCMember |  |  |  |
Core Deposits [Member] |  |  |  |  |  |  |  |  |
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 10 years |  |  |  |  |  |  |  |
m2 Lease Funds LLC [Member] | Quad City Bank and Trust Company [Member] |  |  |  |  |  |  |  |  |
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  | 20.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = qcrh_M2LeaseFundsLLCMember / dei_LegalEntityAxis = qcrh_QuadCityBankAndTrustCompanyMember |  |  |
m2 Lease Funds LLC [Member] |  |  |  |  |  |  |  |  |
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  | 20.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = qcrh_M2LeaseFundsLLCMember | 80.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = qcrh_M2LeaseFundsLLCMember |
Velie Plantation Holding Company LLC [Member] |  |  |  |  |  |  |  |  |
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  |  | 9.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = qcrh_VeliePlantationHoldingCompanyLLCMember
Minimum [Member] |  |  |  |  |  |  |  |  |
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |  |
Residual Value Percent of Cost | 3.00%qcrh_ResidualValuePercentOfCost / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |  |
Debt Instrument, Term | 3 years |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |  |
Residual Value Percent of Cost | 15.00%qcrh_ResidualValuePercentOfCost / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |
Debt Instrument, Term | 5 years |  |  |  |  |  |  |  |
Line of Credit Facility, Expiration Period | 365 days |  |  |  |  |  |  |  |
General Maximum [Member] |  |  |  |  |  |  |  |  |
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Term | 7 years |  |  |  |  |  |  |  |
Ruhl Mortgage [Member] | Quad City Bank and Trust Company [Member] |  |  |  |  |  |  |  |  |
Note 1 - Nature of Business and Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_CounterpartyNameAxis = qcrh_RuhlMortgageMember / dei_LegalEntityAxis = qcrh_QuadCityBankAndTrustCompanyMember |  |  |  |  |  |  |  |

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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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