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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