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Note 6 - Derivatives and Hedging Activities (Details) - Changes in Fair Values of Derivative Financial Instruments (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Amount of loss recognized in other comprehensive income, net of tax $ 11,708,770us-gaap_OtherComprehensiveIncomeLossNetOfTax $ (18,350,669)us-gaap_OtherComprehensiveIncomeLossNetOfTax $ (48,031)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Hedge Ineffectiveness [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Amount reclassified from accumulated other comprehensive income (30,212)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_DerivativeByNatureAxis
= qcrh_HedgeIneffectivenessMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
   
Caplet Amortization [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Amount reclassified from accumulated other comprehensive income 65us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_DerivativeByNatureAxis
= qcrh_CapletAmortizationMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
   
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Amount of loss recognized in other comprehensive income, net of tax (369,220)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
   
Unrealized loss at end of period, net of tax $ (399,367)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember