Note 7 - Accrued Expenses (Details Textual) - Forecast [Member]	Mar. 31, 2022 USD ($)
Unsecured Liability, Purchase of Intangible Technology, Payable, Number of Quarterly Installment	3
Unsecured Liability, Purchase of Intangible Technology, Payable, Each Quarter	$ 500,000

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