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Note 12 - Subsequent Events (Details Textual) $ in Millions	Apr. 16, 2021 USD ($)
Subsequent Event [Member]
Commitment to Build Property	$ 1.7

X

- Definition

The value of commitment to build property.

+ References

No definition available.

+ Details

Name:	atlo_CommitmentToBuildProperty
Namespace Prefix:	atlo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: