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Note 13 - Commitments, Contingencies and Concentrations of Credit Risk (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2021	Apr. 16, 2021	Dec. 31, 2020
Fixed Interest Rate, Commitments to Extend Credit	$ 129,800		$ 131,800
Liabilities to Cover Credit Losses for Off Balance Sheet	692		$ 713
Commitment to Build New Branch in West Des Moines, Iowa [Member]
Other Commitment, Total	$ 1,000	$ 1,800

X

- Definition

Represents fixed interest rate commitments to extend credit, as of balance sheet date.

+ References

No definition available.

+ Details

Name:	atlo_FixedInterestRateCommitmentsToExtendCredit
Namespace Prefix:	atlo_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

This line item represents liabilities to cover estimated credit losses for off-balance-sheet loan commitments and standby letters of credit.

+ References

No definition available.

+ Details

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

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_CommitmentToBuildNewBranchInWestDesMoinesIowaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: