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Note 14 - Subsequent Events (Details Textual) - Subsequent Event [Member] $ in Millions | Apr. 29, 2020 USD ($)
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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: |