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PREPAID EXPENSES AND OTHER RECEIVABLES (Narrative) (Details) - USD ($)	Feb. 28, 2019	Nov. 30, 2018
Prepaid Expense and Other Assets, Current [Abstract]
Prepayment of prepaid expenses and other receivables	$ 583,333	$ 750,000

X

- Definition

It represents prepayment of Prepaid expenses and other receivables.

+ References

No definition available.

+ Details

Name:	sdev_PrepaymentOfPrepaidExpensesAndOtherReceivables
Namespace Prefix:	sdev_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_PrepaidExpenseAndOtherAssetsCurrentAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration