Segment Information (Details Narrative)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Segment Information Details Narrative [Abstract]
Direct import sales to total net sales ratio	10.00%	14.00%

Percentage of direct import sales to total net sales.

No definition available.

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