| Document And Entity Information | May 10, 2023 |
| Document Information [Line Items] | |
| Entity, Registrant Name | AMES NATIONAL CORPORATION |
| Document, Type | 8-K |
| Document, Period End Date | May 10, 2023 |
| Entity, Incorporation, State or Country Code | IA |
| Entity, File Number | 0-32637 |
| Entity, Tax Identification Number | 42-1039071 |
| Entity, Address, Address Line One | 405 Fifth Street |
| Entity, Address, City or Town | Ames |
| Entity, Address, State or Province | IA |
| Entity, Address, Postal Zip Code | 50010 |
| City Area Code | 515 |
| Local Phone Number | 232-6251 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock |
| Trading Symbol | ATLO |
| Security Exchange Name | NASDAQ |
| Entity, Emerging Growth Company | false |
| Amendment Flag | false |
| Entity, Central Index Key | 0001132651 |
