Note 1 - Summary of Significant Accounting Policies (Details Textual)		12 Months Ended
	Jan. 01, 2023 USD ($)	Dec. 31, 2023 USD ($) Contract Lease $ / shares shares	Dec. 31, 2022 USD ($) $ / shares	Dec. 31, 2021 USD ($) $ / shares	Sep. 28, 2023
Summary of Significant Accounting Policies [Line Items]
Restricted investment in stocks		$ 2,730,000	$ 5,193,000
Conversion factor per share					1.5875
Impairment charge of restricted investment		$ 0
Financing receivable, modifications, subsequent default, number of contracts | Contract		0
Lease option to extend description		QNB typically enters into lease agreements with an initial term of 5 to 10 years and subsequent additional optional terms in increments of 5 years.
Lease option to terminate description		The lease agreements also contain termination options. None of the leases contain purchase options and none transfer the ownership of the leased asset.
Number of operating lease renewed | Lease		1
Lease agreement subsequent additional optional term in increments		5 years
Lease agreement option to extend on increments		true
Lease option to terminate		true
Other Postretirement Benefit Expense		$ 56,000	118,000	$ 87,000
Allocated Share-based Compensation Expense		90,000	70,000	71,000
Employee service Share-based compensation, tax benefit from nonqualified compensation expense and disqualifying dispositions		$ 3,000	$ 2,000	$ 4,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) | $ / shares		$ 4.11	$ 5.20	$ 3.08
Unrecognized Tax Benefits		$ 0
Interest accrued		0
Penalties expense		$ 0
Tax years subject to examination by tax authorities		2020
Valuation allowance		$ 4,000	$ 8,000
Retained earnings	$ 129,808,000	$ 133,945,000	128,951,000
Accounting Standards Update [Extensible Enumeration]	us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201613Member
Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Lease agreements initial terms		5 years
Lease agreement subsequent additional optional term in increments		5 years
Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Lease agreements initial terms		10 years
Lease agreement subsequent additional optional term in increments		10 years
Other Assets [Member]
Summary of Significant Accounting Policies [Line Items]
Other Real Estate, Foreclosed Assets, and Repossessed Assets		$ 0	$ 0
Investment in Federal Home Loan Bank Stock [Member]
Summary of Significant Accounting Policies [Line Items]
Restricted investment in stocks		1,718,000
Investment in Atlantic Community Bankers Bank Stock [Member]
Summary of Significant Accounting Policies [Line Items]
Restricted investment in stocks		12,000
VISA Class B Stock [Member]
Summary of Significant Accounting Policies [Line Items]
Restricted investment in stocks		$ 0
Number of shares owned | shares		6,502
Investment In SHCPFIC Preferred Stock [Member]
Summary of Significant Accounting Policies [Line Items]
Restricted investment in stocks		$ 1,000,000
Number of shares owned | shares		100
Cumulative Effect, Period of Adoption, Adjustment [Member]
Summary of Significant Accounting Policies [Line Items]
Retained earnings	$ 857,000