    <SEC-DOCUMENT>0000097134-20-000028-index.html : 20200615
    <SEC-HEADER>0000097134-20-000028.hdr.sgml : 20200615
    <ACCEPTANCE-DATETIME>20200615124408
    ACCESSION NUMBER:		0000097134-20-000028
    CONFORMED SUBMISSION TYPE:	11-K
    PUBLIC DOCUMENT COUNT:		4
    CONFORMED PERIOD OF REPORT:	20191231
    FILED AS OF DATE:		20200615
    DATE AS OF CHANGE:		20200615

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			TENNANT CO
    		CENTRAL INDEX KEY:			0000097134
    		STANDARD INDUSTRIAL CLASSIFICATION:	REFRIGERATION & SERVICE INDUSTRY MACHINERY [3580]
    		IRS NUMBER:				410572550
    		STATE OF INCORPORATION:			MN
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		11-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-16191
    		FILM NUMBER:		20962617

    	BUSINESS ADDRESS:
    		STREET 1:		701 N LILAC DR
    		STREET 2:		PO BOX 1452
    		CITY:			MINNEAPOLIS
    		STATE:			MN
    		ZIP:			55440
    		BUSINESS PHONE:		7635401200

    	MAIL ADDRESS:
    		STREET 1:		701 N LILAC DR
    		STREET 2:		PO BOX 1452
    		CITY:			MINNEAPOLIS
    		STATE:			MN
    		ZIP:			55440

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	TENNANT G H CO
    		DATE OF NAME CHANGE:	19700515
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>11-K
    <SEQUENCE>1
    <FILENAME>form11-k2019.htm
    <DESCRIPTION>FORM 11-K
    <TEXT>
    Document 1 - file: form11-k2019.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-23
    <SEQUENCE>2
    <FILENAME>exhibit2311-k2019.htm
    <DESCRIPTION>CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
    <TEXT>
    Document 2 - file: exhibit2311-k2019.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>image1.jpg
    <TEXT>
    Document 3 - file: image1.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>image2.jpg
    <TEXT>
    Document 4 - file: image2.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>