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Note 14 - Commitments, Contingencies and Concentrations of Credit Risk (Details Textual) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022
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Fixed Interest Rate, Commitments to Extend Credit | $ 157,700,000 | $ 161,700,000
Liabilities to Cover Credit Losses for Off Balance Sheet | $ 1,100 | $ 798,000

X
- Definition Represents fixed interest rate commitments to extend credit, as of balance sheet date. + References No definition available. + Details
Name: | atlo_FixedInterestRateCommitmentsToExtendCredit
Namespace Prefix: | atlo_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition This line item represents liabilities to cover estimated credit losses for off-balance-sheet loan commitments and standby letters of credit. + References No definition available. + Details
Name: | atlo_LiabilitiesToCoverCreditLossesForOffBalanceSheet
Namespace Prefix: | atlo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant