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Note 3 - Fair Value Measurements (Details Textual) - USD ($) | Mar. 31, 2026 | Dec. 31, 2025 | Mar. 31, 2025
--- | --- | --- | ---
Crypto Asset, Fair Value | $ 160,086 | $ 0 |
Warrant Liabilities, Fair Value Disclosure |  |  | $ 0

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- Definition The fair value of warrant obligations. + References No definition available. + Details
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Namespace Prefix: | sdev_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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