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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