Cover - USD ($)	12 Months Ended
	Dec. 31, 2024	Feb. 27, 2025	Jun. 28, 2024
Cover [Abstract]
Document Type	10-K/A
Amendment Flag	true
Amendment Description	Revised for Items 10, 11, 12, 13 and 14 of Part III
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2024
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2024
Current Fiscal Year End Date	--12-31
Entity File Number	001-39608
Entity Registrant Name	INTRUSION INC.
Entity Central Index Key	0000736012
Entity Tax Identification Number	75-1911917
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	101 EAST PARK BLVD.
Entity Address, Address Line Two	SUITE 1200
Entity Address, City or Town	PLANO
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	75074
City Area Code	(972)
Local Phone Number	234-6400
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	INTZ
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 4,323,644
Entity Common Stock, Shares Outstanding		19,342,776
Document Financial Statement Error Correction [Flag]	false
Insider Trading Policies and Procedures Adopted [Flag]	true
Award Timing, How MNPI Considered [Text Block]	While stock options if awarded are generally awarded in the first or second quarter of each fiscal year, the Board has a policy of making no awards during any period in which the Company is in possession of material non-public information, any such contemplated awards being abated until such time as the information is made public and a reasonable period of time has expired after the disclosure. During the relevant reporting period, no awards of options were granted to a named executive officer within a period starting four business days before and ending one business day after the filing of the issuer’s Form 10-Q or Form 10-K, or the filing or furnishing of a current report on Form 8-K that discloses material nonpublic information.
Award Timing MNPI Considered [Flag]	true