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v3.25.3

Note 4 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Impaired Loans, Carrying Amount | $ 3,900 | $ 475
Impaired Loans, Reserve | 1,400 | 90
Impaired Loans, Fair Value | $ 2,500 | $ 385

X
- Definition The amount of carrying amount of impaired loans. + References No definition available. + Details
Name: | atlo_ImpairedLoansCarryingAmount
Namespace Prefix: | atlo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of fair value of impaired loans. + References No definition available. + Details
Name: | atlo_ImpairedLoansFairValue
Namespace Prefix: | atlo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The reserve for impaired loans. + References No definition available. + Details
Name: | atlo_ImpairedLoansReserve
Namespace Prefix: | atlo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant