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Note 13 - Equity (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Aug. 02, 2021
Stock Repurchase Program, Authorized Amount						$ 50.0
Stock Repurchased During Period, Shares (in shares)	0		0	0	1,700
Stock Repurchased During Period, Value, Gross					$ 11.0
Excise Tax on Corporate Shares Repurchased					$ 0.1
S2024Q1Dividends [member]
Common Stock, Dividends, Per Share, Declared (in dollars per share)		$ 0.6
Dividends		$ 43.0

X

- Definition

The amount of excise tax on corporate shares repurchased.

+ References

No definition available.

+ Details

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Namespace Prefix:	siga_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Equity impact of the value of stock, before excise tax that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

No definition available.

+ Details

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Namespace Prefix:	siga_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481520/505-30-50-4

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Balance Type:	credit
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X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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-Name Accounting Standards Codification
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-Subparagraph (SX 210.3-04)
-Publisher FASB
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X

- Definition

Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock.

+ References

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X

- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Period Type:	duration

X

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