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Note 10 - Common Stock Warrants and Warrant Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Non-cash gain on changes in fair value of warrant liabilities	$ (5,837,607)	$ (0)
The January 2026 Warrants [Member]
Non-cash gain on changes in fair value of warrant liabilities	5,300,000
Warrant Liability [Member]
Warrant liabilities	639,071
Non-cash gain on changes in fair value of warrant liabilities	(5,837,607)
Warrant liabilities	33,715
Warrant Liability [Member] | The January 2026 Warrants [Member]
Fair value of October 2025 Pre-Funded Warrants upon issuance	5,436,649
Warrant Liability [Member] | The October 2025 and January 2026 Pre-Funded Warrants [Member]
Reclassification of October 2025 and January 2026 Pre-Funded Warrant liabilities to equity during period	$ (204,398)

X

- Definition

The amount of warrants or rights reclassified from liability to equity.

+ References

No definition available.

+ Details

Name:	sdev_ClassOfWarrantsOrRightsReclassifiedFromLiabilityToEquity
Namespace Prefix:	sdev_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The fair value of warrants issued during the period.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of expense (income) related to adjustment to fair value of warrant liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

+ Details

Name:	us-gaap_FairValueAdjustmentOfWarrants
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=sdev_TheJanuary2026WarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=sdev_WarrantLiabilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=sdev_TheOctober2025AndJanuary2026PreFundedWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: