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Consolidated Statements of Cash Flows (Parenthetical) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Statement of Cash Flows [Abstract] |  |
Payment of taxes on gain on sale of business | $ 2,907,000 | $ 2,907,000

X
- Definition Payment of taxes on gain on sale of business. + References No definition available. + Details
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Namespace Prefix: | acu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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