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Income Taxes (Details Narrative)	12 Months Ended
Income Taxes (Details Narrative)	Dec. 31, 2020
Hong Kong
Hong Kong income tax rate	16.50%

X

- Definition

Income tax rate charged in foreign jurisdiction.

+ References

No definition available.

+ Details

Name:	acu_ForeignIncomeTaxRate
Namespace Prefix:	acu_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	srt_StatementGeographicalAxis=acu_ReportableSegmentsDMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: