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Note 8 - Per Share Data (Details Textual) - shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Restricted Stock Units RSU Settled in Cash [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	59,312	30,702

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482662/260-10-50-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis=siga_RestrictedStockUnitsRsuSettledInCashMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: