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Note 8 - Debt (Details Textual) - USD ($)				3 Months Ended		9 Months Ended
	Mar. 13, 2020	Nov. 16, 2016	Sep. 02, 2016	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Oct. 01, 2020	Sep. 30, 2020
Repayments of Long-term Debt, Principal						$ (0)		$ 85,913,459
Gain (Loss) on Extinguishment of Debt, Total				$ 0	$ 0	$ 0		$ (4,981,461)
Loan Agreement [Member] | Term Loan [Member] | OCM Strategic Credit SIGTEC Holdings, LLC [Member]
Repayments of Long-term Debt Including Interest	$ 87,200,000
Repayments of Long-term Debt, Principal	80,000,000.0
Repayments of Long-term Debt, Repayment Fee	4,000,000.0
Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total	1,200,000
Repayments of Long-term Debt, Prepayment Premium	$ 1,900,000
Gain (Loss) on Extinguishment of Debt, Total							$ (5,000,000.0)
Proceeds from Issuance of Debt		$ 80,000,000.0
Debt Instrument, Term (Year)			4 years

X

- Definition

The cash outflow for the fee that accompanies the repayment of the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	siga_
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- Definition

The cash outflow for debt including interest initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

No definition available.

+ Details

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- Definition

The cash outflow during the period for the prepayment premium of the debt instrument.

+ References

No definition available.

+ Details

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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X

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123467658&loc=d3e12355-112629

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
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-Section 40
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-URI http://asc.fasb.org/extlink&oid=123467658&loc=d3e12317-112629

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

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- Definition

Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4297-108586

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X

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
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-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585

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