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Note 3 - Concentrations and Restrictions on Cash and Due from Banks and Interest-Bearing Deposits in Financial Institutions (Details Textual) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
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Cash Reserve Requirements |  | $ 8,734,000
Deposits with Other Federal Home Loan Banks | $ 160,950,000 |

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- Definition The Federal Reserve Bank requires member banks to maintain certain cash and due from bank reserves. + References No definition available. + Details
Name: | atlo_CashReserveRequirements
Namespace Prefix: | atlo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of interest-bearing funds deposited into another Federal Home Loan Banks (FHLBanks). + References No definition available. + Details
Name: | us-gaap_DepositsWithOtherFederalHomeLoanBanks
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant