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Note 5 - Loans and Allowance for Loan Losses (Details) - Retail Loans by Credit Quality (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]    
Loans $ 555,251us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 501,752us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Retail:1-4 Family Residential Mortgages [Member] | Performing Financing Receivable [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 36,922us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= qnbc_RetailOneToFourFamilyResidentialMortgagesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 29,329us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= qnbc_RetailOneToFourFamilyResidentialMortgagesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Retail:1-4 Family Residential Mortgages [Member] | Nonperforming Financing Receivable [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 225us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= qnbc_RetailOneToFourFamilyResidentialMortgagesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember		 401us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= qnbc_RetailOneToFourFamilyResidentialMortgagesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
Retail:1-4 Family Residential Mortgages [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 37,147us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= qnbc_RetailOneToFourFamilyResidentialMortgagesMember		 29,730us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= qnbc_RetailOneToFourFamilyResidentialMortgagesMember
Retail Home Equity Loans and Lines [Member] | Performing Financing Receivable [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 63,109us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= qnbc_RetailHomeEquityLoansAndLinesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 59,712us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= qnbc_RetailHomeEquityLoansAndLinesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Retail Home Equity Loans and Lines [Member] | Nonperforming Financing Receivable [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 104us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= qnbc_RetailHomeEquityLoansAndLinesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember		 265us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= qnbc_RetailHomeEquityLoansAndLinesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
Retail Home Equity Loans and Lines [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 63,213us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= qnbc_RetailHomeEquityLoansAndLinesMember		 59,977us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= qnbc_RetailHomeEquityLoansAndLinesMember
Retail:Consumer [Member] | Performing Financing Receivable [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 4,174us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= qnbc_RetailConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 3,099us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= qnbc_RetailConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Retail:Consumer [Member] | Nonperforming Financing Receivable [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 1us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= qnbc_RetailConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember		 17us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= qnbc_RetailConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
Retail:Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 4,175us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= qnbc_RetailConsumerMember		 3,116us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= qnbc_RetailConsumerMember
Total Retail Loans [Member] | Performing Financing Receivable [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 104,205us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= qnbc_TotalRetailLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 92,140us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= qnbc_TotalRetailLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Total Retail Loans [Member] | Nonperforming Financing Receivable [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 330us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= qnbc_TotalRetailLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember		 683us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= qnbc_TotalRetailLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
Total Retail Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans $ 104,535us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= qnbc_TotalRetailLoansMember		 $ 92,823us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= qnbc_TotalRetailLoansMember