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Note 5 - Digital Assets (Details Textual)		3 Months Ended
	Jan. 16, 2026 USD ($) $ / shares	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($)
Crypto Asset, Number of Units		2,153,141,678		0
Crypto Asset, Unrealized Gain, Operating		$ 22,674,000	$ 0
Crypto Asset, Number of Units Received From Equity Issuance		943,599,689
Crypto Asset, Received From Equity Issuance		$ 58,031
Crypto Asset, Fair Value		$ 160,086		$ 0
Crypto Asset, Number of Units Received As Rewards		35,386,649
Crypto Asset, Recevied As Rewards		$ 2,463
SKY Tokens [Member]
Crypto Asset, Number of Units		2,153,141,678
Crypto Asset, Unrealized Gain, Operating		$ 22,700,000
Crypto Asset, Fair Value		$ 160,086,000
January 2026 SKY Tokens [Member]
Crypto Asset, Number of Units Received From Equity Issuance	943,599,689
Crypto Asset, Received From Equity Issuance	$ 58,000,000
Crypto Asset, Per Token Price | $ / shares	$ 0.0615
Crypto Asset, Fair Value	$ 58,000,000
Stablecoins [Member]
Crypto Asset, Fair Value	$ 51,000,000
Staking Award SKY Tokens [Member]
Crypto Asset, Number of Units		2,153,141,678
Crypto Asset, Number of Units Received As Rewards		35,386,649
Crypto Asset, Recevied As Rewards		$ 2,500,000

X

- Definition

The number of crypto assets received as rewards.

+ References

No definition available.

+ Details

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Namespace Prefix:	sdev_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of crypto assets received from equity issuance.

+ References

No definition available.

+ Details

Name:	sdev_CryptoAssetNumberOfUnitsReceivedFromEquityIssuance
Namespace Prefix:	sdev_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The per token price of a crypto asset.

+ References

No definition available.

+ Details

Name:	sdev_CryptoAssetPerTokenPrice
Namespace Prefix:	sdev_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Value amount of crypto assets received from equity issuance.

+ References

No definition available.

+ Details

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

X

- Definition

The value amount of crypto assets received as rewards.

+ References

No definition available.

+ Details

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

X

- Definition

Fair value of crypto asset. Excludes crypto asset held for platform user.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 60
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476162/350-60-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 60
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476162/350-60-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 60
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476162/350-60-50-3

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 60
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476163/350-60-45-1

+ Details

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

X

- Definition

Number of restricted and unrestricted crypto asset units held. Excludes crypto asset units held for platform user.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 60
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476162/350-60-50-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of unrealized gain from remeasurement of crypto asset, classified as operating. Excludes crypto asset held for platform user.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 60
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476162/350-60-50-3

+ Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CryptoAssetAxis=sdev_StablecoinsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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