Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2021	Aug. 10, 2021
Document Information [Line Items]
Entity Central Index Key	0001391933
Entity Registrant Name	QUAINT OAK BANCORP INC
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2021
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2021
Document Transition Report	false
Entity File Number	000-52694
Entity Incorporation, State or Country Code	PA
Entity Tax Identification Number	35-2293957
Entity Address, Address Line One	501 Knowles Avenue
Entity Address, City or Town	Southampton
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	18966
City Area Code	215
Local Phone Number	364-4059
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		2,004,274