Note 1 - Summary of Significant Accounting Policies (Details Textual)	1 Months Ended	3 Months Ended								12 Months Ended
	Jan. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) shares	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2022 USD ($) Lease $ / shares shares	Dec. 31, 2021 USD ($) $ / shares	Dec. 31, 2020 USD ($) $ / shares	Dec. 29, 2022
Summary of Significant Accounting Policies [Line Items]
Restricted investment in stocks		$ 5,193,000				$ 1,329,000				$ 5,193,000	$ 1,329,000
Other than temporary impairment charge of restricted investment										$ 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								5 years
Lease agreement option to extend on increments										true
Lease option to terminate										true
Other Postretirement Benefit Expense										$ 118,000	87,000	$ 0
Allocated Share-based Compensation Expense										85,000	102,000	112,000
Employee service Share-based compensation, tax benefit from nonqualified compensation expense and disqualifying dispositions										$ 2,000	$ 4,000	$ 5,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) | $ / shares										$ 5.20	$ 3.08	$ 2.42
Unrecognized Tax Benefits		$ 0								$ 0
Interest accrued		0								0
Penalties expense										$ 1,000
Tax years subject to examination by tax authorities										2019
Valuation allowance		8,000				0				$ 8,000	$ 0
Recovery recognized										393,000	163,000	$ 239,000
Interest recognized		$ 11,279,000	$ 11,379,000	$ 11,103,000	$ 10,736,000	10,808,000	$ 10,584,000	$ 10,218,000	$ 10,517,000	$ 44,497,000	42,127,000	$ 37,248,000
Subsequent Event [Member]
Summary of Significant Accounting Policies [Line Items]
Recovery recognized	$ 582,000
Interest recognized	$ 489,000
Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Lease agreements initial terms		5 years								5 years
Lease agreement subsequent additional optional term in increments		5 years								5 years
Impact to shareholders equity										$ 750,000
Reduction in allowance for loan losses										$ 1,000,000
Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Lease agreements initial terms		10 years								10 years
Lease agreement subsequent additional optional term in increments		10 years								10 years
Impact to shareholders equity										$ 950,000
Reduction in allowance for loan losses										1,200,000
Other Assets [Member]
Summary of Significant Accounting Policies [Line Items]
Other Real Estate, Foreclosed Assets, and Repossessed Assets		$ 0				$ 0				0	$ 0
Investment in Federal Home Loan Bank Stock [Member]
Summary of Significant Accounting Policies [Line Items]
Restricted investment in stocks		5,181,000								5,181,000
Investment in Atlantic Community Bankers Bank Stock [Member]
Summary of Significant Accounting Policies [Line Items]
Restricted investment in stocks		12,000								12,000
VISA Class B Stock [Member]
Summary of Significant Accounting Policies [Line Items]
Restricted investment in stocks		$ 0								$ 0
Number of shares owned | shares		6,502								6,502
VISA Class A Stock [Member]
Summary of Significant Accounting Policies [Line Items]
Conversion factor per share													1.5991