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Note 3 - Concentrations and Restrictions on Cash and Due from Banks and Interest-Bearing Deposits in Financial Institutions (Details Textual) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Cash Reserve Requirements		$ 8,734,000
Deposits with Other Federal Home Loan Banks	$ 160,950,000

X

- Definition

The Federal Reserve Bank requires member banks to maintain certain cash and due from bank reserves.

+ References

No definition available.

+ Details

Name:	atlo_CashReserveRequirements
Namespace Prefix:	atlo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Amount of interest-bearing funds deposited into another Federal Home Loan Banks (FHLBanks).

+ References

No definition available.

+ Details

Name:	us-gaap_DepositsWithOtherFederalHomeLoanBanks
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant