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Note 7 - Debt and Equity Securities - Proceeds, Gains and Losses From Securities Available-for-sale (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Proceeds from sales of securities available-for-sale | $ 3,385 |
Gross realized gains on securities available-for-sale | 386 |
Gross realized losses on securities available-for-sale |  |
Tax provision applicable to net realized gains on securities available-for-sale | $ 97 |

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- 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

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- 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

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- 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

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- 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