Segment Information (Details Narrative)	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Segment Information Details Narrative [Abstract]
Direct import sales to total net sales ratio	7.00%	6.00%

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