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Note 5 - Off-balance Sheet Arrangements | 3 Months Ended
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Mar. 31, 2020
Notes to Financial Statements |
Loans and Leases Receivable Commitments [Text Block] | 5. Off-Balance Sheet Arrangements The Company is party to financial instruments with off-balance sheet risk in the normal course of business. These financial instruments include commitments to extend credit and standby letters of credit. These instruments involve, to varying degrees, elements of credit risk in excess of the amount recognized in the balance sheet. No material changes in the Company’s off-balance sheet arrangements have occurred since December 31, 2019.

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- Definition Reflects the amount of cash required to fully fund agreements to provide advances to borrowers and lessees at fixed and variable interest rates depending on certain facts or circumstances. + References No definition available. + Details
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Namespace Prefix: | atlo_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration