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Note 4 - Loans Receivable and Credit Disclosures - Credit Risk Profile Based on Payment Activity (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Loan and lease receivable, consumer and residential	$ 301,318
Performing Financial Instruments [Member]
Loan and lease receivable, consumer and residential	300,492
Nonperforming Financial Instruments [Member]
Loan and lease receivable, consumer and residential	826
Family Residential Real Estate 1-4 [Member]
Loan and lease receivable, consumer and residential	285,107
Family Residential Real Estate 1-4 [Member] | Performing Financial Instruments [Member]
Loan and lease receivable, consumer and residential	284,302
Family Residential Real Estate 1-4 [Member] | Nonperforming Financial Instruments [Member]
Loan and lease receivable, consumer and residential	805
Consumer and Other [Member]
Loan and lease receivable, consumer and residential	16,211
Consumer and Other [Member] | Performing Financial Instruments [Member]
Loan and lease receivable, consumer and residential	16,190
Consumer and Other [Member] | Nonperforming Financial Instruments [Member]
Loan and lease receivable, consumer and residential	$ 21

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- Definition

Element defines loans and lease receivable pertaining to consumer and residential loans at book value.

+ References

No definition available.

+ Details

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

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- Details

Name:	us-gaap_FinancialInstrumentPerformanceStatusAxis=us-gaap_PerformingFinancingReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentPerformanceStatusAxis=us-gaap_NonperformingFinancingReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=atlo_FamilyResidentialRealEstate14Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=atlo_ConsumerAndOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: