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Note 7 - Loans Receivable and Credit Disclosures - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Loan and lease receivable, consumer and residential | $ 277,386 | $ 261,842
Performing Financial Instruments [Member] |  |
Loan and lease receivable, consumer and residential | 276,642 | 260,665
Nonperforming Financial Instruments [Member] |  |
Loan and lease receivable, consumer and residential | 744 | 1,177
Family Residential Real Estate 1-4 [Member] |  |
Loan and lease receivable, consumer and residential | 261,690 | 246,745
Family Residential Real Estate 1-4 [Member] | Performing Financial Instruments [Member] |  |
Loan and lease receivable, consumer and residential | 260,968 | 245,598
Family Residential Real Estate 1-4 [Member] | Nonperforming Financial Instruments [Member] |  |
Loan and lease receivable, consumer and residential | 722 | 1,147
Consumer and Other [Member] |  |
Loan and lease receivable, consumer and residential | 15,696 | 15,097
Consumer and Other [Member] | Performing Financial Instruments [Member] |  |
Loan and lease receivable, consumer and residential | 15,674 | 15,067
Consumer and Other [Member] | Nonperforming Financial Instruments [Member] |  |
Loan and lease receivable, consumer and residential | $ 22 | $ 30

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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: |

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- 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: |