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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 ($)
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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: |

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- 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: |

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