Note 7 - Accrued Expenses (Details Textual) Pure in Millions	Dec. 31, 2022
Unsecured Liability, Purchase of Intangible Technology, Payable, Number of Quarterly Installment	0.5

Represents number of quarterly installment related to unsecured liability associated with purchase of intangible technology.

No definition available.

Name:	dla_UnsecuredLiabilityPurchaseOfIntangibleTechnologyPayableNumberOfQuarterlyInstallment
Namespace Prefix:	dla_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant