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Note 13 - Commitments, Contingencies and Concentrations of Credit Risk (Details Textual) - USD ($) $ in Millions | Jun. 30, 2022 | Jun. 09, 2022 | Apr. 16, 2021
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Commitment To Remodel Branch in Ames, Iowa [Member] |  |  |
Other Commitment, Total | $ 3.7 | $ 3.7 |
Commitment to Build New Branch in West Des Moines, Iowa [Member] |  |  |
Other Commitment, Total | $ 96.0 |  | $ 1.7

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_CommitmentToRemodelBranchInAmesIowaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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