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Note 2 - Summary of Significant Accounting Policies 1 (Details Textual) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)
Revenue, Remaining Performance Obligation, Amount	$ 68.7
Unbilled Receivables, Current	16.8
Contract with Customer, Liability, Revenue Recognized	$ 0.5
Research and Development [Member]
Revenue, Performance Obligation, Number of Obligations	4
Manufacture and Delivery [Member]
Revenue, Performance Obligation, Number of Obligations	4

X

- Definition

Represents the number of performance obligations.

+ References

No definition available.

+ Details

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Namespace Prefix:	siga_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

X

- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (a)
-SubTopic 10
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-13

+ Details

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X

- Definition

Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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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Period Type: