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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
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: