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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2021
Feb. 28, 2022
Jun. 30, 2021
Document Information [Line Items]      
Entity Central Index Key 0001132651    
Entity Registrant Name AMES NATIONAL CORPORATION    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021    
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Document Transition Report false    
Entity File Number 0-32637    
Entity Incorporation, State or Country Code IA    
Entity Tax Identification Number 42-1039071    
Entity Address, Address Line One 405 5TH 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    
Title of 12(b) Security Common Stock, $2.00 par value    
Trading Symbol ATLO    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
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 Public Float     $ 219,923,303
Entity Common Stock, Shares Outstanding   9,092,167  
Auditor Name CliftonLarsonAllen LLP    
Auditor Location West Des Moines, IA.    
Auditor Firm ID 655    
ICFR Auditor Attestation Flag false