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Note 5 - Fair Value Measurements - Fair Value Quantitative Information (Details) - Fair Value, Nonrecurring [Member] $ in Thousands	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Collateral dependent loans, fair value	$ 0	$ 385
Fair Value, Inputs, Level 3 [Member]
Collateral dependent loans, fair value	0	385
Impaired Loan [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member]
Collateral dependent loans, fair value	$ 0	$ 385
Impaired Loan [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Minimum [Member] | Measurement Input Valuation Adjustments [Member]
Collateral dependent loans	0	0
Impaired Loan [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Maximum [Member]
Collateral dependent loans	0.20
Impaired Loan [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Maximum [Member] | Measurement Input Valuation Adjustments [Member]
Collateral dependent loans		0.25

X

- Definition

The measurement input of loans held-for-investment.

+ References

No definition available.

+ Details

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Namespace Prefix:	atlo_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

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- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-SubTopic 10
-Topic 825
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482881/825-10-55-10

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482881/825-10-55-12

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- Details

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