Segment Information (Details Narrative)	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Information Details Narrative [Abstract]
Direct import sales to total net sales ratio	10.00%	14.00%	8.00%	11.00%

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