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Note 13 - Commitments, Contingencies and Concentrations of Credit Risk (Details Textual) - USD ($) $ in Thousands | Dec. 31, 2021 | Apr. 16, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Fixed Interest Rate, Commitments to Extend Credit | $ 129,800 |  | $ 131,800
Liabilities to Cover Credit Losses for Off Balance Sheet | 692 |  | $ 713
Commitment to Build New Branch in West Des Moines, Iowa [Member] |  |  |
Other Commitment, Total | $ 1,000 | $ 1,800 |

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

X
- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=atlo_CommitmentToBuildNewBranchInWestDesMoinesIowaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |