    <SEC-DOCUMENT>0001683168-21-000123-index.html : 20210113
    <SEC-HEADER>0001683168-21-000123.hdr.sgml : 20210113
    <ACCEPTANCE-DATETIME>20210113100115
    ACCESSION NUMBER:		0001683168-21-000123
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		22
    CONFORMED PERIOD OF REPORT:	20210113
    ITEM INFORMATION:		Other Events
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20210113
    DATE AS OF CHANGE:		20210113

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			INTRUSION INC
    		CENTRAL INDEX KEY:			0000736012
    		STANDARD INDUSTRIAL CLASSIFICATION:	COMPUTER COMMUNICATIONS EQUIPMENT [3576]
    		IRS NUMBER:				751911917
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-39608
    		FILM NUMBER:		21525286

    	BUSINESS ADDRESS:
    		STREET 1:		1101 ARAPAHO ROAD
    		CITY:			RICHARDSON
    		STATE:			TX
    		ZIP:			75081
    		BUSINESS PHONE:		9722346400

    	MAIL ADDRESS:
    		STREET 1:		1101 ARAPAHO ROAD
    		CITY:			RICHARDSON
    		STATE:			TX
    		ZIP:			75081

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	INTRUSION COM INC
    		DATE OF NAME CHANGE:	20000601

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	ODS NETWORKS INC
    		DATE OF NAME CHANGE:	19970507

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	OPTICAL DATA SYSTEMS INC
    		DATE OF NAME CHANGE:	19950517
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>intrusion_8k.htm
    <DESCRIPTION>FORM 8-K
    <TEXT>
    Document 1 - file: intrusion_8k.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>intrusion_ex9901.htm
    <DESCRIPTION>PRESS RELEASE
    <TEXT>
    Document 2 - file: intrusion_ex9901.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.2
    <SEQUENCE>3
    <FILENAME>intrusion_ex9902.htm
    <DESCRIPTION>INVESTOR RELATIONS PRESENTATION JANUARY 2021
    <TEXT>
    Document 3 - file: intrusion_ex9902.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>image_001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: image_001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>image_002.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: image_002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>image_003.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: image_003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>image_004.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: image_004.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>image_005.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: image_005.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>image_006.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: image_006.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>image_007.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: image_007.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>image_008.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: image_008.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>image_009.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: image_009.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>image_010.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: image_010.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>image_011.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: image_011.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>image_012.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 15 - file: image_012.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>image_013.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 16 - file: image_013.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>image_014.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 17 - file: image_014.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>image_015.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 18 - file: image_015.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>image_016.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 19 - file: image_016.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>20
    <FILENAME>image_017.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 20 - file: image_017.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>21
    <FILENAME>image_018.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 21 - file: image_018.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>22
    <FILENAME>image_019.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 22 - file: image_019.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>