Note 2 - Recent Accounting Pronouncements (Details Textual)	9 Months Ended
	Sep. 30, 2019 Lease
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Lease agreement subsequent additional optional term in increments	5 years
Lease agreement option to extend on increments	true
Lease option to extend description	These rates ranged from 2.82% to 3.46%. 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.
Lease option to terminate	true
Number of operating lease renewed	1
Number of new operating lease renewed	2
Minimum [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Lease rate range	2.82%
Lease agreements initial terms	5 years
Maximum [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Lease rate range	3.46%
Lease agreements initial terms	10 years