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Note 19 - Subsequent Events (Details Textual) - USD ($) | Mar. 15, 2025 | Dec. 23, 2026 | Dec. 22, 2025 | Mar. 20, 2025 | Mar. 14, 2025
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Forecast [Member] | Share Repurchase Program Third Amendment [Member] |  |  |  |  |
Share Repurchase Program, Authorized, Amount |  | $ 750,000 | $ 750,000 |  |
Subsequent Event [Member] |  |  |  |  |
Share Repurchase Program, Period in Force (Month) | 24 months |  |  |  |
Subsequent Event [Member] | Maximum [Member] |  |  |  |  |
Share Repurchase Program, Authorized, Amount |  |  |  |  | $ 3,000,000
Subsequent Event [Member] | Maximum [Member] | Share Repurchase Program Third Amendment [Member] |  |  |  |  |
Share Repurchase Program, Authorized, Amount |  |  |  | $ 1,500,000 |
Subsequent Event [Member] | Minimum [Member] | Share Repurchase Program Third Amendment [Member] |  |  |  |  |
Stock Repurchase Program, Credit Party Liquidity |  |  |  | $ 10,000,000 |

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- Definition The amount of credit party liquidity that the company must maintain under stock repurchase program. + References No definition available. + Details
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Namespace Prefix: | ater_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481520/505-30-50-4 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Period share may be purchased under authorized share repurchase plan, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, repurchase of stock and unit of ownership. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |