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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: |