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