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Note 17 - Fair Value Measurements and Fair Values of Financial Instruments (Details) - Quantitative Information about Assets Measured at Fair Value (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value (in Dollars) 3,827us-gaap_AssetsFairValueDisclosureNonrecurring 3,299us-gaap_AssetsFairValueDisclosureNonrecurring
Market Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Appraisal adjustments 20.00%us-gaap_FairValueInputsComparabilityAdjustments
/ us-gaap_FairValueByAssetClassAxis
= qnbc_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_MarketApproachValuationTechniqueMember		 [1],[2] 10.00%us-gaap_FairValueInputsComparabilityAdjustments
/ us-gaap_FairValueByAssetClassAxis
= qnbc_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_MarketApproachValuationTechniqueMember		 [1],[2]
Liquidation expenses   0.00%qnbc_FairValueInputsLiquidationExpenses
/ us-gaap_FairValueByAssetClassAxis
= qnbc_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_MarketApproachValuationTechniqueMember		 [3]
Market Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Appraisal adjustments 100.00%us-gaap_FairValueInputsComparabilityAdjustments
/ us-gaap_FairValueByAssetClassAxis
= qnbc_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_MarketApproachValuationTechniqueMember		 [1],[2] 30.00%us-gaap_FairValueInputsComparabilityAdjustments
/ us-gaap_FairValueByAssetClassAxis
= qnbc_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_MarketApproachValuationTechniqueMember		 [1],[2]
Liquidation expenses   10.00%qnbc_FairValueInputsLiquidationExpenses
/ us-gaap_FairValueByAssetClassAxis
= qnbc_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_MarketApproachValuationTechniqueMember		 [3]
Market Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value (in Dollars) 953us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= qnbc_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ValuationTechniqueAxis
= us-gaap_MarketApproachValuationTechniqueMember		 [1],[2] 3,107us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= qnbc_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ValuationTechniqueAxis
= us-gaap_MarketApproachValuationTechniqueMember		 [1],[2]
Liquidation expenses 10.00%qnbc_FairValueInputsLiquidationExpenses
/ us-gaap_FairValueByAssetClassAxis
= qnbc_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ValuationTechniqueAxis
= us-gaap_MarketApproachValuationTechniqueMember		 [3]  
Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value (in Dollars) 112us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= qnbc_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ValuationTechniqueAxis
= qnbc_DiscountedCashFlowValuationTechniqueMember		 [4]  
Discount rate 6.375%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= qnbc_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ValuationTechniqueAxis
= qnbc_DiscountedCashFlowValuationTechniqueMember		  
Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage Servicing Rights [Member] | Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Remaining term 2 years 3 years
Discount rate 10.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= qnbc_MortgageServicingRightsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= qnbc_DiscountedCashFlowValuationTechniqueMember		 10.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= qnbc_MortgageServicingRightsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= qnbc_DiscountedCashFlowValuationTechniqueMember
Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage Servicing Rights [Member] | Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Remaining term 28 years 29 years
Discount rate 12.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= qnbc_MortgageServicingRightsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= qnbc_DiscountedCashFlowValuationTechniqueMember		 12.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= qnbc_MortgageServicingRightsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= qnbc_DiscountedCashFlowValuationTechniqueMember
Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage Servicing Rights [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value (in Dollars) 112us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= qnbc_MortgageServicingRightsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ValuationTechniqueAxis
= qnbc_DiscountedCashFlowValuationTechniqueMember		 192us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= qnbc_MortgageServicingRightsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ValuationTechniqueAxis
= qnbc_DiscountedCashFlowValuationTechniqueMember
Agreement of Sale [Member] | Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value (in Dollars) 2,650us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= qnbc_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_ValuationTechniqueAxis
= qnbc_AgreementOfSaleMember		 [5]  
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value (in Dollars) 3,715us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= qnbc_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 3,107us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= qnbc_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Fair Value, Inputs, Level 3 [Member] | Mortgage Servicing Rights [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value (in Dollars) 112us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= qnbc_MortgageServicingRightsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 192us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= qnbc_MortgageServicingRightsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Fair Value, Inputs, Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value (in Dollars) 3,827us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 3,299us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Impaired Loans [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value (in Dollars) 3,715us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= qnbc_ImpairedLoansMember		 3,107us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= qnbc_ImpairedLoansMember
Mortgage Servicing Rights [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value (in Dollars) 112us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= qnbc_MortgageServicingRightsMember		 192us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= qnbc_MortgageServicingRightsMember
[1] Fair value is primarily determined through appraisals of the underlying collateral by independent parties, which generally includes various level 3 inputs which are not always identifiable.
[2] Appraisals may be adjusted by management for qualitative factors such as economic conditions and the age of the appraisal. The range is presented as a percent of the initial appraised value.
[3] Appraisals and pending agreements of sale are adjusted by management for estimated liquidation expenses. The range is presented as a percent of the initial appraised value.
[4] Fair value is determined using the cash flow of the borrower and the effective interest rate of the original note.
[5] Fair value is determined by the net amount due.