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Note 11 - Junior Subordinate Debentures (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2014
Issued in September 2004 [Member] | Junior Subordinated Debt [Member]    
Note 11 - Junior Subordinate Debentures (Details) [Line Items]    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt   $ 3,093,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
/ us-gaap_SubordinatedBorrowingAxis
= qcrh_IssuedInSeptember2004Member
Issued in September 2004 [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Note 11 - Junior Subordinate Debentures (Details) [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 2.17%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_SubordinatedBorrowingAxis
= qcrh_IssuedInSeptember2004Member
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		  
Issued in March 2007 [Member] | Junior Subordinated Debt [Member]    
Note 11 - Junior Subordinate Debentures (Details) [Line Items]    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt 3,609,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
/ us-gaap_SubordinatedBorrowingAxis
= qcrh_IssuedInMarch2007Member		  
Issued in March 2007 [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Note 11 - Junior Subordinate Debentures (Details) [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_SubordinatedBorrowingAxis
= qcrh_IssuedInMarch2007Member
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember