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Note 4 - Inventory (Details Textual) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Inventory Write-down, Net of Credits	$ 548,551	$ 0
Inventory Write-down	$ 900,000

X

- Definition

The amount of gain (loss) on inventory write-down net of credits received.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=116847112&loc=d3e4542-108314

+ Details

Name:	us-gaap_InventoryWriteDown
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration