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Note 9 - Pledged Collateral Related to Securities Sold Under Repurchase Agreements - Pledged Collateral at Estimated Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Maturity Overnight [Member]
Securities sold under agreements to repurchase	$ 53,156
Maturity Overnight [Member] | US Treasury and Government [Member] | Collateral Related to Securities Sold Under Agreements to Repurchase [Member]
Securities sold under agreements to repurchase	2,060
Maturity Overnight [Member] | US Government Agencies Debt Securities [Member] | Collateral Related to Securities Sold Under Agreements to Repurchase [Member]
Securities sold under agreements to repurchase	36,445
Maturity Overnight [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Collateral Related to Securities Sold Under Agreements to Repurchase [Member]
Securities sold under agreements to repurchase	$ 14,651
Maturity Greater than 90 Days [Member]
Securities sold under agreements to repurchase		$ 55,751
Maturity Greater than 90 Days [Member] | US Treasury and Government [Member] | Collateral Related to Securities Sold Under Agreements to Repurchase [Member]
Securities sold under agreements to repurchase		2,069
Maturity Greater than 90 Days [Member] | US Government Agencies Debt Securities [Member] | Collateral Related to Securities Sold Under Agreements to Repurchase [Member]
Securities sold under agreements to repurchase		39,362
Maturity Greater than 90 Days [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Collateral Related to Securities Sold Under Agreements to Repurchase [Member]
Securities sold under agreements to repurchase		$ 14,320

X

- Definition

Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
-URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728

+ Details

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

X

- Details

Name:	us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis=us-gaap_MaturityOvernightMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USTreasuryAndGovernmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CollateralAxis=atlo_CollateralRelatedToSecuritiesSoldUnderAgreementsToRepurchaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis=us-gaap_MaturityOver90DaysMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: