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Note 16 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Impaired Loans, Carrying Amount | $ 483 | $ 224
Impaired Loans, Reserve | 98 | 119
Impaired Loans, Fair Value | $ 385 | $ 105

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