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Note 7 - Deposits (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Note 7 - Deposits (Details) [Line Items]    
Time Deposits, $250,000 or More $ 230,925,385qcrh_TimeDeposits250000OrMore $ 222,017,080qcrh_TimeDeposits250000OrMore
Federal Home Loan Bank of Des Moines [Member]    
Note 7 - Deposits (Details) [Line Items]    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 15,000,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfDesMoinesMember		  
Letters of Credit Outstanding, Amount $ 0us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfDesMoinesMember