Note 17 - Share-based Compensation - RSU Compensation Expense and the Related Income Tax Benefit (Details) - Restricted Stock Units (RSUs) [Member] - USD ($) $ in Thousands	12 Months Ended
Feb. 01, 2020	Feb. 02, 2019	Feb. 03, 2018
Compensation (income) expense	$ (1,756)	$ 287	$ 1,645
Income tax provision (benefit)	452	(74)	(620)
Compensation (income) expense, net of income tax provision (benefit)	$ (1,304)	$ 213	$ 1,025

Amount of tax provision (benefit) for recognition of (Income) expense of award under share-based payment arrangement.

No definition available.

Name:	cal_SharebasedPaymentArrangementIncomeExpenseTaxProvisionBenefit
Namespace Prefix:	cal_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration