The number of crypto assets received as rewards.

No definition available.

Name:	sdev_CryptoAssetNumberOfUnitsReceivedAsRewards
Namespace Prefix:	sdev_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- 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

- 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

- 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

- Definition

The value amount of crypto assets received as rewards.

+ References

No definition available.

+ Details

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

- 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

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

- 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

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

- Definition

Amount of unrealized gain (loss) 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 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476163/350-60-45-2

+ Details

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

- Details

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

- Details

Name:	srt_CryptoAssetAxis=sdev_January2026SKYTokensMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	srt_CryptoAssetAxis=sdev_StakingAwardSKYTokensMember
Namespace Prefix:
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Note 5 - Digital Assets (Details Textual) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Jan. 16, 2026 USD ($) $ / shares	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)
Crypto Asset, Number of Units		2,286,511,374		2,286,511,374		0
Crypto Asset, Unrealized Gain (Loss), Operating		$ (50,633)	$ 0	$ (27,959)	$ 0
Crypto Asset, Number of Units Received From Equity Issuance		943,599,689		943,599,689
Crypto Asset, Received From Equity Issuance				$ 58,031
Crypto Asset, Fair Value		$ 119,242		$ 119,242		$ 0
Crypto Asset, Number of Units Received As Rewards				67,132,900
Crypto Asset, Recevied As Rewards				$ 4,669
SKY Tokens [Member]
Crypto Asset, Number of Units		2,286,511,374		2,286,511,374
Crypto Asset, Unrealized Gain (Loss), Operating		$ (50,600)		$ (28,000)
Crypto Asset, Fair Value		$ 119,242		$ 119,242
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
Crypto Asset, Per Token Price \| $ / shares	$ 0.0615
Crypto Asset, Fair Value	$ 58,000
Stablecoins [Member]
Crypto Asset, Fair Value	$ 51,000
Staking Award SKY Tokens [Member]
Crypto Asset, Number of Units		2,286,023,773		2,286,023,773
Crypto Asset, Number of Units Received As Rewards		31,746,251		67,132,900
Crypto Asset, Recevied As Rewards		$ 2,200		$ 4,700