Note 18 - Financial Information for the Company and its Subsidiaries (Details Textual)	May 02, 2020
Percentage, Ownership of Guarantors by Parent	100.00%

The percentage ownership of guarantors by the Parent.

No definition available.

Name:	cal_PercentageOwnershipOfGuarantorsByParent
Namespace Prefix:	cal_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant