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Note 16 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Impaired Loans, Carrying Amount	$ 224	$ 399
Impaired Loans, Reserve	119	95
Impaired Loans, Fair Value	$ 105	$ 304

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