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Note 7 - Debt Securities - Proceeds, Gains and Losses From Securities Available-for-sale (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Proceeds from sales of securities available-for-sale	$ 0	$ 2,238	$ 5,463	$ 8,211
Gross realized gains on securities available-for-sale	0	16	430	37
Gross realized losses on securities available-for-sale	0	(1)	0	(20)
Tax provision applicable to net realized gains on securities available-for-sale	$ 0	$ 4	$ 108	$ 4

X

- Definition

Element defines tax provision made during the period for realized gains on securities available for sale.

+ References

No definition available.

+ Details

Name:	atlo_NetRealizedGainsOnSecuritiesAvailableForSaleTaxProvision
Namespace Prefix:	atlo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities, including recorded in other assets pending settlement.

+ References

No definition available.

+ Details

Name:	atlo_ProceedsFromSaleOfAvailableForSaleSecuritiesIncludingRecordedInOtherAssetsPendingSettlement
Namespace Prefix:	atlo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleRealizedGain
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563

+ Details

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