Note 12 - Employee Benefit Plans (Details Textual) - USD ($) $ in Thousands		12 Months Ended
	May 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Employee Benefit Plans [Line Items]
Defined contribution plan, plan name		QNB Bank Retirement Savings Plan
Matching company contribution		3.00%
Safe harbor non-elective contributions		5.00%
Matching contribution, amount		$ 340	$ 340	$ 309
Safe harbor contribution, amount		$ 608	$ 608	$ 533
Employee Stock Purchase Plan 2016 [Member]
Employee Benefit Plans [Line Items]
Discount rate on common stock		10.00%
Shares authorized for issuance		30,000
Shares issued	18,792
Expiration date		May 31, 2021
Employee Stock Purchase Plan 2021 [Member]
Employee Benefit Plans [Line Items]
Shares authorized for issuance		30,000
Shares issued		2,162
Expiration date		May 31, 2026