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Note 15 - Related Party Transactions (Details Textual) - USD ($) $ in Thousands		3 Months Ended
	Jan. 16, 2026	Mar. 31, 2026
Monthly Consulting Fee		$ 25
Payment for Consulting Fees		$ 75
January 2026 Private Placement [Member]
Equity Offering, Period for Right to Consent Modification of Digital Asset Strategy	24 months
Equity Offering, Right to Consent Modification of Digital Asset Strategy, Percentage of Original Purchase Owned	50.00%

X

- Definition

Period for right to consent modification of digital assets strategy.

+ References

No definition available.

+ Details

Name:	sdev_EquityOfferingPeriodForRightToConsentModificationOfDigitalAssetStrategy
Namespace Prefix:	sdev_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of original purchase required to be owned for right to consent modification of digital assets strategy.

+ References

No definition available.

+ Details

Name:	sdev_EquityOfferingRightToConsentModificationOfDigitalAssetStrategyPercentageOfOriginalPurchaseOwned
Namespace Prefix:	sdev_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of monthly consulting fee.

+ References

No definition available.

+ Details

Name:	sdev_MonthlyConsultingFee
Namespace Prefix:	sdev_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of cash outflow due to consulting fees during the period.

+ References

No definition available.

+ Details

Name:	sdev_PaymentForConsultingFees
Namespace Prefix:	sdev_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=sdev_January2026PrivatePlacementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: