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Note 10 - Common Stock Warrants and Warrant Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended
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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
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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
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Data Type: | xbrli:monetaryItemType
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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
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Period Type: | instant

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

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

X
- Details
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Namespace Prefix: |
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Balance Type: |
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