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Note 9 - Goodwill (Details Textual) - USD ($)		3 Months Ended
	Oct. 25, 2019	Mar. 31, 2020
Finite Tax Lived Intangible Asset, Useful Life (Year)		25 years
Iowa State Savings Bank [Member]
Goodwill, Acquired During Period	$ 2,680,000

X

- Definition

Useful tax life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	atlo_FiniteTaxLivedIntangibleAssetUsefulLife
Namespace Prefix:	atlo_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

+ Details

Name:	us-gaap_GoodwillAcquiredDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=atlo_IowaStateSavingsBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: