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Note 14 - Commitments, Contingencies and Concentrations of Credit Risk (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Fixed Interest Rate, Commitments to Extend Credit	$ 123,700	$ 157,700
Liabilities to Cover Credit Losses for Off Balance Sheet	$ 943	$ 1,100

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