    <SEC-DOCUMENT>0001193125-18-250036-index.html : 20180816
    <SEC-HEADER>0001193125-18-250036.hdr.sgml : 20180816
    <ACCEPTANCE-DATETIME>20180815213435
    ACCESSION NUMBER:		0001193125-18-250036
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		8
    CONFORMED PERIOD OF REPORT:	20180814
    ITEM INFORMATION:		Entry into a Material Definitive Agreement
    ITEM INFORMATION:		Material Modifications to Rights of Security Holders
    ITEM INFORMATION:		Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year
    ITEM INFORMATION:		Other Events
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20180816
    DATE AS OF CHANGE:		20180815

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			GLADSTONE INVESTMENT CORPORATION\DE
    		CENTRAL INDEX KEY:			0001321741
    		IRS NUMBER:				830423116
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	814-00704
    		FILM NUMBER:		181022212

    	BUSINESS ADDRESS:
    		STREET 1:		1521 WESTBRANCH DRIVE
    		STREET 2:		SUITE 100
    		CITY:			MCLEAN
    		STATE:			VA
    		ZIP:			22102
    		BUSINESS PHONE:		7032875800

    	MAIL ADDRESS:
    		STREET 1:		1521 WESTBRANCH DRIVE
    		STREET 2:		SUITE 100
    		CITY:			MCLEAN
    		STATE:			VA
    		ZIP:			22102
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>d603656d8k.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: d603656d8k.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-1.1
    <SEQUENCE>2
    <FILENAME>d603656dex11.htm
    <DESCRIPTION>EX-1.1
    <TEXT>
    Document 2 - file: d603656dex11.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-3.1
    <SEQUENCE>3
    <FILENAME>d603656dex31.htm
    <DESCRIPTION>EX-3.1
    <TEXT>
    Document 3 - file: d603656dex31.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-4.1
    <SEQUENCE>4
    <FILENAME>d603656dex41.htm
    <DESCRIPTION>EX-4.1
    <TEXT>
    Document 4 - file: d603656dex41.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>5
    <FILENAME>d603656dex991.htm
    <DESCRIPTION>EX-99.1
    <TEXT>
    Document 5 - file: d603656dex991.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>g603656g0816001005629.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: g603656g0816001005629.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>g603656page060.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: g603656page060.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>g603656page061.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: g603656page061.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>