XML 81 R57.htm IDEA: XBRL DOCUMENT
v3.20.1

Note 9 - Goodwill (Details Textual) - USD ($) |  | 3 Months Ended
--- | --- | ---
Oct. 25, 2019 | Mar. 31, 2020
Finite Tax Lived Intangible Asset, Useful Life (Year) |  | 25 years
Iowa State Savings Bank [Member] |  |
Goodwill, Acquired During Period | $ 2,680,000 |

X
- Definition Useful tax life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | atlo_FiniteTaxLivedIntangibleAssetUsefulLife
Namespace Prefix: | atlo_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillAcquiredDuringPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=atlo_IowaStateSavingsBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |