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Note 14 - Subsequent Events (Details Textual) - Subsequent Event [Member] $ in Millions	Apr. 29, 2020 USD ($)
Financing Receivable Number of Payment Deferrals	88
Financing Receivable, Deferred Payments	$ 60
Financing Receivable, Number of Loans, Funded Through CARES Act	627
Financing Receivable, Funded Through CARES Act	$ 72

X

- Definition

Deferred amounts on loans receivable related to loan modification programs offered to financial institution customers affected by COVID-19.

+ References

No definition available.

+ Details

Name:	atlo_FinancingReceivableDeferredPayments
Namespace Prefix:	atlo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of financing receivable that funded by the company in connection with the CARES Act.

+ References

No definition available.

+ Details

Name:	atlo_FinancingReceivableFundedThroughCaresAct
Namespace Prefix:	atlo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Number of loans are funded by the company in connection with the CARES Act.

+ References

No definition available.

+ Details

Name:	atlo_FinancingReceivableNumberOfLoansFundedThroughCARESAct
Namespace Prefix:	atlo_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of payment deferrals on loans receivable related to loan modification programs offered to financial institution customers affected by COVID-19.

+ References

No definition available.

+ Details

Name:	atlo_FinancingReceivableNumberOfPaymentDeferrals
Namespace Prefix:	atlo_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: