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Note 7 - Loans Receivable and Credit Disclosures - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Loan and lease receivable, consumer and residential | $ 246,814 | $ 228,610
Performing Financial Instruments [Member] |  |
Loan and lease receivable, consumer and residential | 245,728 | 227,285
Nonperforming Financial Instruments [Member] |  |
Loan and lease receivable, consumer and residential | 1,086 | 1,325
Family Residential Real Estate 1-4 [Member] |  |
Loan and lease receivable, consumer and residential | 231,468 | 213,562
Family Residential Real Estate 1-4 [Member] | Performing Financial Instruments [Member] |  |
Loan and lease receivable, consumer and residential | 230,385 | 212,282
Family Residential Real Estate 1-4 [Member] | Nonperforming Financial Instruments [Member] |  |
Loan and lease receivable, consumer and residential | 1,083 | 1,280
Consumer and Other [Member] |  |
Loan and lease receivable, consumer and residential | 15,346 | 15,048
Consumer and Other [Member] | Performing Financial Instruments [Member] |  |
Loan and lease receivable, consumer and residential | 15,343 | 15,003
Consumer and Other [Member] | Nonperforming Financial Instruments [Member] |  |
Loan and lease receivable, consumer and residential | $ 3 | $ 45

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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: |