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Note 15 - Commitments, Contingencies and Concentrations of Credit Risk (Details Textual) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
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Fixed Interest Rate, Commitments to Extend Credit | $ 131,862,000 | $ 135,679,000
Liabilities to Cover Credit Losses for Off Balance Sheet | $ 713,000 | $ 662,000

X
- Definition Represents fixed interest rate commitments to extend credit, as of balance sheet date. + References No definition available. + Details
Name: | atlo_FixedInterestRateCommitmentsToExtendCredit
Namespace Prefix: | atlo_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition This line item represents liabilities to cover estimated credit losses for off-balance-sheet loan commitments and standby letters of credit. + References No definition available. + Details
Name: | atlo_LiabilitiesToCoverCreditLossesForOffBalanceSheet
Namespace Prefix: | atlo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant