| Document And Entity Information | Oct. 27, 2021 |
| Document Information [Line Items] | |
| Entity, Registrant Name | QUAINT OAK BANCORP, INC. |
| Document, Type | 8-K/A |
| Document, Period End Date | Oct. 27, 2021 |
| Entity, Incorporation, State or Country Code | PA |
| Entity, File Number | 000-52694 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity, Emerging Growth Company | false |
| Amendment Description | 8-K/A Earnings |
| Amendment Flag | true |
| Entity, Central Index Key | 0001391933 |
