<SEC-DOCUMENT>0001437749-20-003598.txt : 20200226
<SEC-HEADER>0001437749-20-003598.hdr.sgml : 20200226
<ACCEPTANCE-DATETIME>20200226160925
ACCESSION NUMBER:		0001437749-20-003598
CONFORMED SUBMISSION TYPE:	8-K
PUBLIC DOCUMENT COUNT:		13
CONFORMED PERIOD OF REPORT:	20200225
ITEM INFORMATION:		Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant
FILED AS OF DATE:		20200226
DATE AS OF CHANGE:		20200226

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Otter Tail Corp
		CENTRAL INDEX KEY:			0001466593
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRIC SERVICES [4911]
		IRS NUMBER:				270383995
		STATE OF INCORPORATION:			MN
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		8-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-53713
		FILM NUMBER:		20655743

	BUSINESS ADDRESS:	
		STREET 1:		215 S CASCADE ST
		STREET 2:		PO BOX 496
		CITY:			FERGUS FALLS
		STATE:			MN
		ZIP:			56538-0496
		BUSINESS PHONE:		866-410-8780

	MAIL ADDRESS:	
		STREET 1:		215 S CASCADE ST
		STREET 2:		PO BOX 496
		CITY:			FERGUS FALLS
		STATE:			MN
		ZIP:			56538-0496

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Otter Tail Holding Co
		DATE OF NAME CHANGE:	20090618
</SEC-HEADER>
<DOCUMENT>
<TYPE>8-K
<SEQUENCE>1
<FILENAME>ottr20200224_8k.htm
<DESCRIPTION>FORM 8-K
<TEXT>
<XBRL>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:ref="http://www.xbrl.org/2006/ref" xmlns:xbrldi="http://xbrl.org/2006/xbrldi" xmlns:naics="http://xbrl.sec.gov/naics/2011-01-31" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:ixt-sec="http://www.sec.gov/inlineXBRL/transformation/2015-08-31" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ixt="http://www.xbrl.org/inlineXBRL/transformation/2015-02-26" xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:us-types="http://fasb.org/us-types/2017-01-31" xmlns:utreg="http://www.xbrl.org/2009/utr" xmlns:invest="http://xbrl.sec.gov/invest/2013-01-31" xmlns:ix="http://www.xbrl.org/2013/inlineXBRL" xmlns:us-roles="http://fasb.org/us-roles/2017-01-31" xmlns:stpr="http://xbrl.sec.gov/stpr/2018-01-31" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:iso4217="http://www.xbrl.org/2003/iso4217" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:thunderdome="http://www.RDGFilings.com" xmlns:utr="http://www.xbrl.org/2009/utr" xmlns:xs="http://www.w3.org/2001/XMLSchema-instance" xmlns:dei="http://xbrl.sec.gov/dei/2019-01-31" xmlns:ottr="http://www.ottr.com/20200225" xmlns:us-gaap="http://fasb.org/us-gaap/2019-01-31" xmlns:country="http://xbrl.sec.gov/country/2017-01-31" xmlns:rr="http://xbrl.sec.gov/rr/2018-01-31" xmlns:sic="http://xbrl.sec.gov/sic/2011-01-31" xmlns:currency="http://xbrl.sec.gov/currency/2017-01-31" xmlns:exch="http://xbrl.sec.gov/exch/2018-01-31" xmlns:srt="http://fasb.org/srt/2019-01-31"><head>
	<title>ottr20200224_8k.htm</title>
	<!-- Generated by ThunderDome Portal - 2/26/2020 12:55:22 AM -->
<meta http-equiv="Content-Type" content="text/html" /></head>
<body style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt; padding: 0in 0.1in; cursor: auto;"><div style="display: none">
<ix:header>
<ix:hidden>
<ix:nonNumeric contextRef="d20208K" name="dei:AmendmentFlag">false</ix:nonNumeric>
<ix:nonNumeric contextRef="d20208K" name="dei:EntityCentralIndexKey">0001466593</ix:nonNumeric>

</ix:hidden>
<ix:references>
<link:schemaRef xlink:href="ottr-20200225.xsd" xlink:type="simple" />
</ix:references>
<ix:resources>
<xbrli:context id="d20208K">
<xbrli:entity>
<xbrli:identifier scheme="http://www.sec.gov/CIK">0001466593</xbrli:identifier>
</xbrli:entity>
<xbrli:period>
<xbrli:startDate>2020-02-25</xbrli:startDate>
<xbrli:endDate>2020-02-25</xbrli:endDate>
</xbrli:period>
</xbrli:context>


</ix:resources>
</ix:header>
</div>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:12pt;margin:0pt;text-align:center;"><b>UNITED STATES</b></p>

<p style="font-family:'Times New Roman', Times, serif;font-size:12pt;margin:0pt;text-align:center;"><b>SECURITIES AND EXCHANGE COMMISSION</b></p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;"><b>WASHINGTON, D.C. 20549</b></p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">&#xa0;</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:12pt;margin:0pt;text-align:center;"><b>FORM <ix:nonNumeric contextRef="d20208K" name="dei:DocumentType"><b>8-K</b></ix:nonNumeric></b></p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">&#xa0;</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;"><b>CURRENT REPORT</b></p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;"><b>Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934</b></p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;"><b>&#xa0;</b></p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;"><b>Date of report (Date of earliest event reported</b><b>): </b><ix:nonNumeric contextRef="d20208K" format="ixt:datemonthdayyearen" name="dei:DocumentPeriodEndDate"><b>February 25, 2020</b></ix:nonNumeric></p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">&#xa0;</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:12pt;margin:0pt;text-align:center;"><ix:nonNumeric contextRef="d20208K" name="dei:EntityRegistrantName"><b>OTTER TAIL CORPORATION</b></ix:nonNumeric></p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">(Exact name of registrant as specified in its charter)</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">&#xa0;</p>

<table border="0" cellpadding="0" cellspacing="0" style="width:100%;text-indent:0;font-family:'Times New Roman', Times, serif;font-size:10pt;">

		<tbody><tr>
			<td style="vertical-align:top;width:33%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;"><ix:nonNumeric contextRef="d20208K" format="ixt-sec:stateprovnameen" name="dei:EntityIncorporationStateCountryCode">Minnesota</ix:nonNumeric></p>
			</td>
			<td style="vertical-align: bottom; width: 33%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;"><ix:nonNumeric contextRef="d20208K" name="dei:EntityFileNumber">0-53713</ix:nonNumeric></p>
			</td>
			<td style="vertical-align:top;width:33%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;"><ix:nonNumeric contextRef="d20208K" name="dei:EntityTaxIdentificationNumber">27-0383995</ix:nonNumeric></p>
			</td>
		</tr>
		<tr>
			<td style="vertical-align:top;width:33%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">(State or other jurisdiction</p>

			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">of incorporation)</p>
			</td>
			<td style="vertical-align: bottom; width: 33%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">(Commission</p>

			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">File Number)</p>
			</td>
			<td style="vertical-align:top;width:33%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">(I.R.S. Employer</p>

			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">Identification No.)</p>
			</td>
		</tr>

</tbody></table>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;"><b>&#xa0;</b></p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;"><ix:nonNumeric contextRef="d20208K" name="dei:EntityAddressAddressLine1"><b>215 South Cascade Street</b></ix:nonNumeric><b>, <ix:nonNumeric contextRef="d20208K" name="dei:EntityAddressAddressLine2"><b>P.O. Box 496</b></ix:nonNumeric>, <ix:nonNumeric contextRef="d20208K" name="dei:EntityAddressCityOrTown"><b>Fergus Falls</b></ix:nonNumeric>, <ix:nonNumeric contextRef="d20208K" name="dei:EntityAddressStateOrProvince"><b>MN</b></ix:nonNumeric> <ix:nonNumeric contextRef="d20208K" name="dei:EntityAddressPostalZipCode"><b>56538-0496</b></ix:nonNumeric></b></p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">(Address of principal executive offices, including zip code)</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;"><b>&#xa0;</b></p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;"><b>(<ix:nonNumeric contextRef="d20208K" name="dei:CityAreaCode"><b>866</b></ix:nonNumeric>) <ix:nonNumeric contextRef="d20208K" name="dei:LocalPhoneNumber"><b>410-8780</b></ix:nonNumeric></b></p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">(Registrant&#8217;s telephone number, including area code)</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;"><b>&#xa0;</b></p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;"><b>Not Applicable</b></p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">(Former name or former address, if changed since last report)</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">&#xa0;</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">Securities registered pursuant to Section 12(b) of the Securities Exchange Act of 1934:</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">&#xa0;</p>

<table border="0" cellpadding="0" cellspacing="0" style="width: 100%; text-indent: 0px; font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt; border: 1px solid rgb(0, 0, 0);">

		<tbody><tr>
			<td style="vertical-align:top;border-bottom:solid 1px #000000;;width:37%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">Title of each class</p>
			</td>
			<td style="vertical-align: top; border-bottom: 1px solid rgb(0, 0, 0); width: 25%; border-left: thin solid rgb(0, 0, 0); border-right: thin solid rgb(0, 0, 0);">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">Trading Symbol(s)</p>
			</td>
			<td style="vertical-align:top;border-bottom:solid 1px #000000;;width:38%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">Name of each exchange on which registered</p>
			</td>
		</tr>
		<tr>
			<td style="vertical-align: top; width: 37%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;"><ix:nonNumeric contextRef="d20208K" name="dei:Security12bTitle">Common Shares</ix:nonNumeric>, par value $5.00 per share</p>
			</td>
			<td style="vertical-align: top; width: 25%; border-left: thin solid rgb(0, 0, 0); border-right: thin solid rgb(0, 0, 0);">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;"><ix:nonNumeric contextRef="d20208K" name="dei:TradingSymbol">OTTR</ix:nonNumeric></p>
			</td>
			<td style="vertical-align: top; width: 38%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;"><ix:nonNumeric contextRef="d20208K" format="ixt-sec:exchnameen" name="dei:SecurityExchangeName">The Nasdaq Stock Market LLC</ix:nonNumeric></p>
			</td>
		</tr>

</tbody></table>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">&#xa0;</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"><ix:nonNumeric contextRef="d20208K" format="ixt-sec:boolballotbox" name="dei:WrittenCommunications">&#9744;</ix:nonNumeric> Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"><ix:nonNumeric contextRef="d20208K" format="ixt-sec:boolballotbox" name="dei:SolicitingMaterial">&#9744;</ix:nonNumeric> Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"><ix:nonNumeric contextRef="d20208K" format="ixt-sec:boolballotbox" name="dei:PreCommencementTenderOffer">&#9744;</ix:nonNumeric> Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"><ix:nonNumeric contextRef="d20208K" format="ixt-sec:boolballotbox" name="dei:PreCommencementIssuerTenderOffer">&#9744;</ix:nonNumeric> Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule 12b-2 of the Securities Exchange Act of 1934.</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">Emerging growth company&#xa0;<ix:nonNumeric contextRef="d20208K" format="ixt-sec:boolballotbox" name="dei:EntityEmergingGrowthCompany">&#9744;</ix:nonNumeric></p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.&#xa0;&#9744;</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>

<div class="PGBK" style="width: 100%; margin-left: 0pt; margin-right: 0pt">
<div class="PGFTR" style="text-align: center; width: 100%">
<div class="hf-row">
<div class="hf-cell PGNUM">&#xa0;</div>
</div>
</div>

<hr style="PAGE-BREAK-AFTER: always; border: none; width: 100%; height: 2px; color: #000000; background-color: #000000" />
<div class="PGHDR" style="text-align: left; width: 100%">
<div class="hf-row">
<div class="hf-cell TOCLink">&#xa0;</div>
</div>
</div>
</div>

<p style="font-family: 'Times New Roman', Times, serif; font-size: 10pt; margin: 0pt; text-align: left">&#xa0;</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"><b>Item 2.03 &#xa0;&#xa0;&#xa0;&#xa0;&#xa0;Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.</b>&#xa0;</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;text-indent:36pt;">&#xa0;</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;text-indent:36pt;">As previously reported in a Form 8-K filed by Otter Tail Corporation on September 16, 2019, (the &#8220;September 8-K&#8221;), on September 12, 2019, Otter Tail Power Company (the &#8220;Company&#8221;), a wholly owned subsidiary of Otter Tail Corporation (&#8220;OTC&#8221;), entered into a Note Purchase Agreement (the &#8220;Note Purchase Agreement&#8221;) with the purchasers named therein (the &#8220;Purchasers&#8221;), pursuant to which the Company has agreed to issue to the Purchasers, in private placement transactions, $175 million aggregate principal amount of the Company&#8217;s senior unsecured notes consisting of (a) $10,000,000 aggregate principal amount of its 3.07% Series 2019A Senior Unsecured Notes due October 10, 2029 (the &#8220;Series 2019A Notes&#8221;), (b) $26,000,000 aggregate principal amount of its 3.52% Series 2019B Senior Unsecured Notes due October 10, 2039 (the &#8220;Series 2019B Notes&#8221;), (c) $64,000,000 aggregate principal amount of its 3.82% Series 2019C Senior Unsecured Notes due October 10, 2049 (the &#8220;Series 2019C Notes&#8221;), (d) $10,000,000 aggregate principal amount of its 3.22% Series 2020A Senior Unsecured Notes due February 25, 2030 (the &#8220;Series 2020A Notes&#8221;), (e) $40,000,000 aggregate principal amount of its 3.22% Series 2020B Senior Unsecured Notes due August 20, 2030 (the &#8220;Series 2020B Notes&#8221;), (f) $10,000,000 aggregate principal amount of its 3.62% Series 2020C Senior Unsecured Notes due February 25, 2040 (the &#8220;Series 2020C Notes&#8221;) and (g) $15,000,000 aggregate principal amount of its 3.92% Series 2020D Senior Unsecured Notes due February 25, 2050 (the &#8220;Series 2020D Notes&#8221;; and together with the Series 2019A Notes, the Series 2019B Notes, the Series 2019C Notes, the Series 2020A Notes, the Series 2020B Notes and the Series 2020C Notes, the &#8220;Notes&#8221;).</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;text-indent:36pt;">&#xa0;</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;text-indent:36pt;">On February 25, 2020, the Company issued the Series 2020A Notes, Series 2020C Notes and Series 2020D Notes pursuant to the Note Purchase Agreement. The Company&#xa0;will use the&#xa0;proceeds from the issuance to pay for future capital expenditures and for general corporate purposes. The Series 2019A Notes, Series 2019B Notes and Series 2019C Notes were issued by the Company on October 10, 2019. The remaining unissued notes of the Note Purchase Agreement, Series 2020B, are expected to be issued on August 20, 2020, subject to the satisfaction of certain customary conditions to closing.</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;text-indent:36pt;">As reported in the September 8-K, the Note Purchase Agreement states that the Company may prepay all or any part of the Notes (in an amount not less than 10% of the aggregate principal amount of the Notes then outstanding in the case of a partial prepayment) at 100% of the principal amount so prepaid, together with unpaid accrued interest and a make-whole amount; provided that if no default or event of default exists under the Note Purchase Agreement, any prepayment made by the Company of all of the (a) Series 2020A Notes then outstanding on or after August 25, 2029, (b) Series 2020C Notes then outstanding on or after August 25, 2039 or (c) Series 2020D Notes then outstanding on or after August 25, 2049 will be made without any make-whole amount. The Note Purchase Agreement also requires the Company to offer to prepay all outstanding Notes at 100% of the principal amount together with unpaid accrued interest in the event of a Change of Control (as defined in the Note Purchase Agreement) of the Company.</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;text-indent:13.5pt;">&#xa0;</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;text-indent:13.5pt;">As reported in the September 8-K, the Note Purchase Agreement contains a number of restrictions on the business of the Company. These include restrictions on the Company&#8217;s abilities to merge, sell assets, create or incur liens on assets, guarantee the obligations of any other party, and engage in transactions with related parties. The Note Purchase Agreement also contains other negative covenants and events of default, as well as certain financial covenants. Specifically, the Company may not permit its Interest-bearing Debt (as defined in the Note Purchase Agreement) to exceed 60% of Total Capitalization (as defined in the Note Purchase Agreement), determined as of the end of each fiscal quarter. The Company is also restricted from allowing its Priority Indebtedness (as defined in the Note Purchase Agreement) to exceed 20% of Total Capitalization, determined as of the end of each fiscal quarter. The Note Purchase Agreement does not include provisions for the termination of the agreement or the acceleration of repayment of amounts outstanding due to changes in the Company&#8217;s credit ratings. The Note Purchase Agreement includes a &#8220;most favored lender&#8221; provision generally requiring that in the event the Company&#8217;s existing credit agreement or any renewal, extension or replacement thereof, at any time contains any financial covenant or other provision providing for limitations on interest expense and such a covenant is not contained in the Note Purchase Agreement under substantially similar terms or would be more beneficial to the holders of the Notes than any analogous provision contained in the Note Purchase Agreement (an &#8220;Additional Covenant&#8221;), then unless</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;text-indent:13.5pt;">&#xa0;</p>

<div class="PGBK" style="width: 100%; margin-left: 0pt; margin-right: 0pt">
<div class="PGFTR" style="text-align: center; width: 100%">
<div class="hf-row">
<div class="hf-cell PGNUM">&#xa0;</div>
</div>
</div>

<hr style="PAGE-BREAK-AFTER: always; border: none; width: 100%; height: 2px; color: #000000; background-color: #000000" />
<div class="PGHDR" style="text-align: left; width: 100%">
<div class="hf-row">
<div class="hf-cell TOCLink">&#xa0;</div>
</div>
</div>
</div>

<p style="font-family: 'Times New Roman', Times, serif; font-size: 10pt; margin: 0pt; text-align: left">&#xa0;</p>

<p style="font-family: &quot;Times New Roman&quot;, Times, serif; font-size: 10pt; margin: 0pt; text-align: left;">waived by the Required Holders (as defined in the Note Purchase Agreement), the Additional Covenant will be deemed to be incorporated into the Note Purchase Agreement. The Note Purchase Agreement also provides for the amendment, modification or deletion of an Additional Covenant if such Additional Covenant is amended or modified under or deleted from the credit agreement, provided that no default or event of default has occurred and is continuing.</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;text-indent:13.5pt;">&#xa0;</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;text-indent:36pt;">The foregoing summary of the material terms of the Note Purchase Agreement is qualified in its entirety by reference to the full text of the Note Purchase Agreement, a copy of which was filed as Exhibit 4.1 to the September 8-K and is incorporated herein by reference.</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;text-indent:36pt;">&#xa0;</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;"><b>SIGNATURE</b></p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">&#xa0;</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>

<table border="0" cellpadding="0" cellspacing="0" style="width:100%;text-indent:0;font-family:'Times New Roman', Times, serif;font-size:10pt;">

		<tbody><tr>
			<td style="vertical-align: top; width: 35%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>
			</td>
			<td style="vertical-align: top; width: 14%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>
			</td>
			<td colspan="3" style="vertical-align: top; width: 44%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">OTTER TAIL CORPORATION</p>
			</td>
		</tr>
		<tr>
			<td style="vertical-align: top; width: 35%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>
			</td>
			<td style="vertical-align: top; width: 14%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>
			</td>
			<td colspan="3" style="vertical-align: top; width: 44%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>
			</td>
		</tr>
		<tr>
			<td style="vertical-align: top; width: 35%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>
			</td>
			<td style="vertical-align: top; width: 14%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>
			</td>
			<td colspan="3" style="vertical-align: top; width: 44%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>
			</td>
		</tr>
		<tr>
			<td style="vertical-align: top; width: 35%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">Date: February&#xa0;26,&#xa0;2020</p>
			</td>
			<td style="vertical-align: top; width: 14%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>
			</td>
			<td style="vertical-align: top; width: 4%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">By:</p>
			</td>
			<td style="vertical-align: top; border-bottom: 1px solid rgb(0, 0, 0); width: 40%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">/s/&#xa0;Kevin G. Moug</p>
			</td>
			<td style="vertical-align: top; width: 7%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>
			</td>
		</tr>
		<tr>
			<td style="vertical-align: top; width: 35%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>
			</td>
			<td style="vertical-align: top; width: 14%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>
			</td>
			<td style="vertical-align: top; width: 4%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>
			</td>
			<td colspan="2" style="vertical-align: top; width: 40%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">Kevin G. Moug</p>
			</td>
		</tr>
		<tr>
			<td style="vertical-align: top; width: 35%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>
			</td>
			<td style="vertical-align: top; width: 14%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>
			</td>
			<td style="vertical-align: top; width: 4%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>
			</td>
			<td colspan="2" style="vertical-align: top; width: 40%;">
			<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">Chief Financial Officer</p>
			</td>
		</tr>

</tbody></table>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin-bottom:0pt;margin-left:0pt;margin-right:27pt;margin-top:0pt;text-align:left;">&#xa0;</p>

<p style="font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">&#xa0;</p>


</body></html>
</XBRL>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.SCH
<SEQUENCE>2
<FILENAME>ottr-20200225.xsd
<DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA
<TEXT>
<XBRL>
<?xml version="1.0" encoding="US-ASCII" standalone="no"?>
<!--Generated by ThunderDome Portal - 2/26/2020 12:55:28 AM-->
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:country="http://xbrl.sec.gov/country/2017-01-31" xmlns:currency="http://xbrl.sec.gov/currency/2017-01-31" xmlns:dei="http://xbrl.sec.gov/dei/2019-01-31" xmlns:ottr="http://www.ottr.com/20200225" xmlns:exch="http://xbrl.sec.gov/exch/2018-01-31" xmlns:invest="http://xbrl.sec.gov/invest/2013-01-31" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:sic="http://xbrl.sec.gov/sic/2011-01-31" xmlns:stpr="http://xbrl.sec.gov/stpr/2018-01-31" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xlink="http://www.w3.org/1999/xlink" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.ottr.com/20200225">
<xsd:import namespace="http://xbrl.sec.gov/country/2017-01-31" schemaLocation="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd"/>
<xsd:import namespace="http://xbrl.sec.gov/currency/2017-01-31" schemaLocation="http://xbrl.sec.gov/currency/2017/currency-2017-01-31.xsd"/>
<xsd:import namespace="http://xbrl.sec.gov/dei/2019-01-31" schemaLocation="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd"/>
<xsd:import namespace="http://xbrl.sec.gov/exch/2018-01-31" schemaLocation="https://xbrl.sec.gov/exch/2018/exch-2018-01-31.xsd"/>
<xsd:import namespace="http://xbrl.sec.gov/invest/2013-01-31" schemaLocation="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd"/>
<xsd:import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd"/>
<xsd:import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd"/>
<xsd:import namespace="http://xbrl.sec.gov/sic/2011-01-31" schemaLocation="http://xbrl.sec.gov/sic/2011/sic-2011-01-31.xsd"/>
<xsd:import namespace="http://xbrl.sec.gov/stpr/2018-01-31" schemaLocation="https://xbrl.sec.gov/stpr/2018/stpr-2018-01-31.xsd"/>
<xsd:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
<xsd:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
<xsd:import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd"/>

<xsd:annotation>
<xsd:appinfo>
<link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="ottr-20200225_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
<link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="ottr-20200225_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
<link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="ottr-20200225_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
<link:roleType id="statement-document-and-entity-information" roleURI="http://www.ottr.com/20200225/role/statement-document-and-entity-information">
<link:definition xmlns="http://www.xbrl.org/2003/linkbase">000 - Document - Document And Entity Information</link:definition>
<link:usedOn>link:calculationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:presentationLink</link:usedOn>
</link:roleType>
</xsd:appinfo>
</xsd:annotation>
<xsd:element abstract="true" id="ottr_DocumentAndEntityInformation" name="DocumentAndEntityInformation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
</xsd:schema>
</XBRL>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.DEF
<SEQUENCE>3
<FILENAME>ottr-20200225_def.xml
<DESCRIPTION>XBRL TAXONOMY EXTENSION DEFINITION LINKBASE
<TEXT>
<XBRL>
<?xml version="1.0" encoding="US-ASCII" standalone="no"?>
<!--Generated by ThunderDome Portal - 2/26/2020 12:55:28 AM-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" xlink:type="simple"/>
<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" xlink:type="simple"/>
<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" xlink:type="simple"/>
<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" xlink:type="simple"/>
<link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" xlink:type="simple"/>
<link:roleRef roleURI="http://www.ottr.com/20200225/role/statement-document-and-entity-information" xlink:href="ottr-20200225.xsd#statement-document-and-entity-information" xlink:type="simple"/>
<link:definitionLink xlink:role="http://www.ottr.com/20200225/role/statement-document-and-entity-information" xlink:type="extended">
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain-default" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentInformationTable" xlink:label="dei_DocumentInformationTable" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentInformationLineItems" xlink:label="dei_DocumentInformationLineItems" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentType" xlink:label="dei_DocumentType" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="dei_DocumentPeriodEndDate" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityRegistrantName" xlink:label="dei_EntityRegistrantName" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityIncorporationStateCountryCode" xlink:label="dei_EntityIncorporationStateCountryCode" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityFileNumber" xlink:label="dei_EntityFileNumber" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityTaxIdentificationNumber" xlink:label="dei_EntityTaxIdentificationNumber" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressAddressLine1" xlink:label="dei_EntityAddressAddressLine1" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressAddressLine2" xlink:label="dei_EntityAddressAddressLine2" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressCityOrTown" xlink:label="dei_EntityAddressCityOrTown" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressStateOrProvince" xlink:label="dei_EntityAddressStateOrProvince" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressPostalZipCode" xlink:label="dei_EntityAddressPostalZipCode" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_CityAreaCode" xlink:label="dei_CityAreaCode" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_LocalPhoneNumber" xlink:label="dei_LocalPhoneNumber" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_Security12bTitle" xlink:label="dei_Security12bTitle" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_TradingSymbol" xlink:label="dei_TradingSymbol" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_SecurityExchangeName" xlink:label="dei_SecurityExchangeName" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_WrittenCommunications" xlink:label="dei_WrittenCommunications" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_SolicitingMaterial" xlink:label="dei_SolicitingMaterial" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_PreCommencementTenderOffer" xlink:label="dei_PreCommencementTenderOffer" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_PreCommencementIssuerTenderOffer" xlink:label="dei_PreCommencementIssuerTenderOffer" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityEmergingGrowthCompany" xlink:label="dei_EntityEmergingGrowthCompany" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_AmendmentFlag" xlink:label="dei_AmendmentFlag" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="dei_EntityCentralIndexKey" xlink:type="locator"/>
<link:definitionArc order="0" xbrldt:closed="true" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" xlink:type="arc"/>
<link:definitionArc order="1" xbrldt:closed="true" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain-default" xlink:type="arc"/>

<link:definitionArc order="0" xbrldt:closed="true" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="dei_DocumentInformationTable" xlink:to="dei_LegalEntityAxis" xlink:type="arc"/>


<link:definitionArc order="0" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentInformationTable" xlink:type="arc"/>
<link:definitionArc order="1" xbrldt:closed="true" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentType" xlink:type="arc"/>
<link:definitionArc order="2" xbrldt:closed="true" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentPeriodEndDate" xlink:type="arc"/>
<link:definitionArc order="3" xbrldt:closed="true" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityRegistrantName" xlink:type="arc"/>
<link:definitionArc order="4" xbrldt:closed="true" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityIncorporationStateCountryCode" xlink:type="arc"/>
<link:definitionArc order="5" xbrldt:closed="true" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityFileNumber" xlink:type="arc"/>
<link:definitionArc order="6" xbrldt:closed="true" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityTaxIdentificationNumber" xlink:type="arc"/>
<link:definitionArc order="7" xbrldt:closed="true" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityAddressAddressLine1" xlink:type="arc"/>
<link:definitionArc order="8" xbrldt:closed="true" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityAddressAddressLine2" xlink:type="arc"/>
<link:definitionArc order="9" xbrldt:closed="true" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityAddressCityOrTown" xlink:type="arc"/>
<link:definitionArc order="10" xbrldt:closed="true" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityAddressStateOrProvince" xlink:type="arc"/>
<link:definitionArc order="11" xbrldt:closed="true" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityAddressPostalZipCode" xlink:type="arc"/>
<link:definitionArc order="12" xbrldt:closed="true" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_CityAreaCode" xlink:type="arc"/>
<link:definitionArc order="13" xbrldt:closed="true" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_LocalPhoneNumber" xlink:type="arc"/>
<link:definitionArc order="14" xbrldt:closed="true" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_Security12bTitle" xlink:type="arc"/>
<link:definitionArc order="15" xbrldt:closed="true" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_TradingSymbol" xlink:type="arc"/>
<link:definitionArc order="16" xbrldt:closed="true" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_SecurityExchangeName" xlink:type="arc"/>
<link:definitionArc order="17" xbrldt:closed="true" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_WrittenCommunications" xlink:type="arc"/>
<link:definitionArc order="18" xbrldt:closed="true" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_SolicitingMaterial" xlink:type="arc"/>
<link:definitionArc order="19" xbrldt:closed="true" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_PreCommencementTenderOffer" xlink:type="arc"/>
<link:definitionArc order="20" xbrldt:closed="true" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_PreCommencementIssuerTenderOffer" xlink:type="arc"/>
<link:definitionArc order="21" xbrldt:closed="true" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityEmergingGrowthCompany" xlink:type="arc"/>
<link:definitionArc order="22" xbrldt:closed="true" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_AmendmentFlag" xlink:type="arc"/>
<link:definitionArc order="23" xbrldt:closed="true" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityCentralIndexKey" xlink:type="arc"/>

</link:definitionLink>
</link:linkbase>
</XBRL>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.LAB
<SEQUENCE>4
<FILENAME>ottr-20200225_lab.xml
<DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE
<TEXT>
<XBRL>
<?xml version="1.0" encoding="US-ASCII" standalone="no"?>
<!--Generated by ThunderDome Portal - 2/26/2020 12:55:28 AM-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
<link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedLabel" xlink:type="simple"/>
<link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodEndLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodEndLabel" xlink:type="simple"/>
<link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodStartLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodStartLabel" xlink:type="simple"/>
<link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTotalLabel" xlink:type="simple"/>
<link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTerseLabel" xlink:type="simple"/>
<link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedNetLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedNetLabel" xlink:type="simple"/>
<link:roleRef roleURI="http://www.xbrl.org/2009/role/netLabel" xlink:href="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd#netLabel" xlink:type="simple"/>
<link:labelLink xlink:role="http://www.xbrl.org/2003/role/link" xlink:type="extended">
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" xlink:type="locator"/>
<link:label xlink:label="dei_EntityDomain-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity [Domain]</link:label>
<link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityDomain" xlink:to="dei_EntityDomain-label" xlink:type="arc"/>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" xlink:type="locator"/>
<link:label xlink:label="dei_LegalEntityAxis-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Legal Entity [Axis]</link:label>
<link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_LegalEntityAxis" xlink:to="dei_LegalEntityAxis-label" xlink:type="arc"/>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentInformationLineItems" xlink:label="dei_DocumentInformationLineItems" xlink:type="locator"/>
<link:label xlink:label="dei_DocumentInformationLineItems-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Information [Line Items]</link:label>
<link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentInformationLineItems-label" xlink:type="arc"/>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentInformationTable" xlink:label="dei_DocumentInformationTable" xlink:type="locator"/>
<link:label xlink:label="dei_DocumentInformationTable-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Information [Table]</link:label>
<link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentInformationTable" xlink:to="dei_DocumentInformationTable-label" xlink:type="arc"/>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentType" xlink:label="dei_DocumentType" xlink:type="locator"/>
<link:label xlink:label="dei_DocumentType-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document, Type</link:label>
<link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentType" xlink:to="dei_DocumentType-label" xlink:type="arc"/>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="dei_DocumentPeriodEndDate" xlink:type="locator"/>
<link:label xlink:label="dei_DocumentPeriodEndDate-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document, Period End Date</link:label>
<link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentPeriodEndDate" xlink:to="dei_DocumentPeriodEndDate-label" xlink:type="arc"/>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityRegistrantName" xlink:label="dei_EntityRegistrantName" xlink:type="locator"/>
<link:label xlink:label="dei_EntityRegistrantName-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity, Registrant Name</link:label>
<link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityRegistrantName" xlink:to="dei_EntityRegistrantName-label" xlink:type="arc"/>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityIncorporationStateCountryCode" xlink:label="dei_EntityIncorporationStateCountryCode" xlink:type="locator"/>
<link:label xlink:label="dei_EntityIncorporationStateCountryCode-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity, Incorporation, State or Country Code</link:label>
<link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityIncorporationStateCountryCode" xlink:to="dei_EntityIncorporationStateCountryCode-label" xlink:type="arc"/>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityFileNumber" xlink:label="dei_EntityFileNumber" xlink:type="locator"/>
<link:label xlink:label="dei_EntityFileNumber-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity, File Number</link:label>
<link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityFileNumber" xlink:to="dei_EntityFileNumber-label" xlink:type="arc"/>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityTaxIdentificationNumber" xlink:label="dei_EntityTaxIdentificationNumber" xlink:type="locator"/>
<link:label xlink:label="dei_EntityTaxIdentificationNumber-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity, Tax Identification Number</link:label>
<link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityTaxIdentificationNumber" xlink:to="dei_EntityTaxIdentificationNumber-label" xlink:type="arc"/>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressAddressLine1" xlink:label="dei_EntityAddressAddressLine1" xlink:type="locator"/>
<link:label xlink:label="dei_EntityAddressAddressLine1-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity, Address, Address Line One</link:label>
<link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressAddressLine1" xlink:to="dei_EntityAddressAddressLine1-label" xlink:type="arc"/>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressAddressLine2" xlink:label="dei_EntityAddressAddressLine2" xlink:type="locator"/>
<link:label xlink:label="dei_EntityAddressAddressLine2-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity, Address, Address Line Two</link:label>
<link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressAddressLine2" xlink:to="dei_EntityAddressAddressLine2-label" xlink:type="arc"/>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressCityOrTown" xlink:label="dei_EntityAddressCityOrTown" xlink:type="locator"/>
<link:label xlink:label="dei_EntityAddressCityOrTown-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity, Address, City or Town</link:label>
<link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressCityOrTown" xlink:to="dei_EntityAddressCityOrTown-label" xlink:type="arc"/>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressStateOrProvince" xlink:label="dei_EntityAddressStateOrProvince" xlink:type="locator"/>
<link:label xlink:label="dei_EntityAddressStateOrProvince-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity, Address, State or Province</link:label>
<link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressStateOrProvince" xlink:to="dei_EntityAddressStateOrProvince-label" xlink:type="arc"/>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressPostalZipCode" xlink:label="dei_EntityAddressPostalZipCode" xlink:type="locator"/>
<link:label xlink:label="dei_EntityAddressPostalZipCode-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity, Address, Postal Zip Code</link:label>
<link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressPostalZipCode" xlink:to="dei_EntityAddressPostalZipCode-label" xlink:type="arc"/>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_CityAreaCode" xlink:label="dei_CityAreaCode" xlink:type="locator"/>
<link:label xlink:label="dei_CityAreaCode-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">City Area Code</link:label>
<link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_CityAreaCode" xlink:to="dei_CityAreaCode-label" xlink:type="arc"/>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_LocalPhoneNumber" xlink:label="dei_LocalPhoneNumber" xlink:type="locator"/>
<link:label xlink:label="dei_LocalPhoneNumber-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Local Phone Number</link:label>
<link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_LocalPhoneNumber" xlink:to="dei_LocalPhoneNumber-label" xlink:type="arc"/>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_Security12bTitle" xlink:label="dei_Security12bTitle" xlink:type="locator"/>
<link:label xlink:label="dei_Security12bTitle-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Title of 12(b) Security</link:label>
<link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_Security12bTitle" xlink:to="dei_Security12bTitle-label" xlink:type="arc"/>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_TradingSymbol" xlink:label="dei_TradingSymbol" xlink:type="locator"/>
<link:label xlink:label="dei_TradingSymbol-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Trading Symbol</link:label>
<link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_TradingSymbol" xlink:to="dei_TradingSymbol-label" xlink:type="arc"/>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_SecurityExchangeName" xlink:label="dei_SecurityExchangeName" xlink:type="locator"/>
<link:label xlink:label="dei_SecurityExchangeName-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Security Exchange Name</link:label>
<link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_SecurityExchangeName" xlink:to="dei_SecurityExchangeName-label" xlink:type="arc"/>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_WrittenCommunications" xlink:label="dei_WrittenCommunications" xlink:type="locator"/>
<link:label xlink:label="dei_WrittenCommunications-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Written Communications</link:label>
<link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_WrittenCommunications" xlink:to="dei_WrittenCommunications-label" xlink:type="arc"/>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_SolicitingMaterial" xlink:label="dei_SolicitingMaterial" xlink:type="locator"/>
<link:label xlink:label="dei_SolicitingMaterial-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Soliciting Material</link:label>
<link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_SolicitingMaterial" xlink:to="dei_SolicitingMaterial-label" xlink:type="arc"/>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_PreCommencementTenderOffer" xlink:label="dei_PreCommencementTenderOffer" xlink:type="locator"/>
<link:label xlink:label="dei_PreCommencementTenderOffer-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pre-commencement Tender Offer</link:label>
<link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_PreCommencementTenderOffer" xlink:to="dei_PreCommencementTenderOffer-label" xlink:type="arc"/>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_PreCommencementIssuerTenderOffer" xlink:label="dei_PreCommencementIssuerTenderOffer" xlink:type="locator"/>
<link:label xlink:label="dei_PreCommencementIssuerTenderOffer-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Pre-commencement Issuer Tender Offer</link:label>
<link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_PreCommencementIssuerTenderOffer" xlink:to="dei_PreCommencementIssuerTenderOffer-label" xlink:type="arc"/>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityEmergingGrowthCompany" xlink:label="dei_EntityEmergingGrowthCompany" xlink:type="locator"/>
<link:label xlink:label="dei_EntityEmergingGrowthCompany-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity, Emerging Growth Company</link:label>
<link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityEmergingGrowthCompany" xlink:to="dei_EntityEmergingGrowthCompany-label" xlink:type="arc"/>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_AmendmentFlag" xlink:label="dei_AmendmentFlag" xlink:type="locator"/>
<link:label xlink:label="dei_AmendmentFlag-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amendment Flag</link:label>
<link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_AmendmentFlag" xlink:to="dei_AmendmentFlag-label" xlink:type="arc"/>

<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="dei_EntityCentralIndexKey" xlink:type="locator"/>
<link:label xlink:label="dei_EntityCentralIndexKey-label" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity, Central Index Key</link:label>
<link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityCentralIndexKey" xlink:to="dei_EntityCentralIndexKey-label" xlink:type="arc"/>

</link:labelLink>
</link:linkbase>
</XBRL>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.PRE
<SEQUENCE>5
<FILENAME>ottr-20200225_pre.xml
<DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE
<TEXT>
<XBRL>
<?xml version="1.0" encoding="US-ASCII" standalone="no"?>
<!--Generated by ThunderDome Portal - 2/26/2020 12:55:28 AM-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
<link:roleRef roleURI="http://www.ottr.com/20200225/role/statement-document-and-entity-information" xlink:href="ottr-20200225.xsd#statement-document-and-entity-information" xlink:type="simple"/>
<link:presentationLink xlink:role="http://www.ottr.com/20200225/role/statement-document-and-entity-information" xlink:type="extended">
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentInformationTable" xlink:label="dei_DocumentInformationTable" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentInformationLineItems" xlink:label="dei_DocumentInformationLineItems" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentType" xlink:label="dei_DocumentType" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="dei_DocumentPeriodEndDate" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityRegistrantName" xlink:label="dei_EntityRegistrantName" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityIncorporationStateCountryCode" xlink:label="dei_EntityIncorporationStateCountryCode" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityFileNumber" xlink:label="dei_EntityFileNumber" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityTaxIdentificationNumber" xlink:label="dei_EntityTaxIdentificationNumber" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressAddressLine1" xlink:label="dei_EntityAddressAddressLine1" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressAddressLine2" xlink:label="dei_EntityAddressAddressLine2" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressCityOrTown" xlink:label="dei_EntityAddressCityOrTown" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressStateOrProvince" xlink:label="dei_EntityAddressStateOrProvince" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressPostalZipCode" xlink:label="dei_EntityAddressPostalZipCode" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_CityAreaCode" xlink:label="dei_CityAreaCode" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_LocalPhoneNumber" xlink:label="dei_LocalPhoneNumber" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_Security12bTitle" xlink:label="dei_Security12bTitle" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_TradingSymbol" xlink:label="dei_TradingSymbol" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_SecurityExchangeName" xlink:label="dei_SecurityExchangeName" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_WrittenCommunications" xlink:label="dei_WrittenCommunications" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_SolicitingMaterial" xlink:label="dei_SolicitingMaterial" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_PreCommencementTenderOffer" xlink:label="dei_PreCommencementTenderOffer" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_PreCommencementIssuerTenderOffer" xlink:label="dei_PreCommencementIssuerTenderOffer" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityEmergingGrowthCompany" xlink:label="dei_EntityEmergingGrowthCompany" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_AmendmentFlag" xlink:label="dei_AmendmentFlag" xlink:type="locator"/>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="dei_EntityCentralIndexKey" xlink:type="locator"/>
<link:presentationArc order="0" preferredLabel="http://www.xbrl.org/2003/role/label" xbrldt:closed="true" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" xlink:type="arc"/>

<link:presentationArc order="0" preferredLabel="http://www.xbrl.org/2003/role/label" xbrldt:closed="true" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="dei_DocumentInformationTable" xlink:to="dei_LegalEntityAxis" xlink:type="arc"/>

<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/label" xbrldt:closed="true" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="dei_DocumentInformationTable" xlink:to="dei_DocumentInformationLineItems" xlink:type="arc"/>
<link:presentationArc order="0" preferredLabel="http://www.xbrl.org/2003/role/label" xbrldt:closed="true" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityRegistrantName" xlink:type="arc"/>
<link:presentationArc order="1" preferredLabel="http://www.xbrl.org/2003/role/label" xbrldt:closed="true" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentType" xlink:type="arc"/>
<link:presentationArc order="2" preferredLabel="http://www.xbrl.org/2003/role/label" xbrldt:closed="true" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentPeriodEndDate" xlink:type="arc"/>
<link:presentationArc order="3" preferredLabel="http://www.xbrl.org/2003/role/label" xbrldt:closed="true" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityIncorporationStateCountryCode" xlink:type="arc"/>
<link:presentationArc order="4" preferredLabel="http://www.xbrl.org/2003/role/label" xbrldt:closed="true" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityFileNumber" xlink:type="arc"/>
<link:presentationArc order="5" preferredLabel="http://www.xbrl.org/2003/role/label" xbrldt:closed="true" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityTaxIdentificationNumber" xlink:type="arc"/>
<link:presentationArc order="6" preferredLabel="http://www.xbrl.org/2003/role/label" xbrldt:closed="true" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityAddressAddressLine1" xlink:type="arc"/>
<link:presentationArc order="7" preferredLabel="http://www.xbrl.org/2003/role/label" xbrldt:closed="true" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityAddressAddressLine2" xlink:type="arc"/>
<link:presentationArc order="8" preferredLabel="http://www.xbrl.org/2003/role/label" xbrldt:closed="true" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityAddressCityOrTown" xlink:type="arc"/>
<link:presentationArc order="9" preferredLabel="http://www.xbrl.org/2003/role/label" xbrldt:closed="true" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityAddressStateOrProvince" xlink:type="arc"/>
<link:presentationArc order="10" preferredLabel="http://www.xbrl.org/2003/role/label" xbrldt:closed="true" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityAddressPostalZipCode" xlink:type="arc"/>
<link:presentationArc order="11" preferredLabel="http://www.xbrl.org/2003/role/label" xbrldt:closed="true" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_CityAreaCode" xlink:type="arc"/>
<link:presentationArc order="12" preferredLabel="http://www.xbrl.org/2003/role/label" xbrldt:closed="true" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_LocalPhoneNumber" xlink:type="arc"/>
<link:presentationArc order="13" preferredLabel="http://www.xbrl.org/2003/role/label" xbrldt:closed="true" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_Security12bTitle" xlink:type="arc"/>
<link:presentationArc order="14" preferredLabel="http://www.xbrl.org/2003/role/label" xbrldt:closed="true" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_TradingSymbol" xlink:type="arc"/>
<link:presentationArc order="15" preferredLabel="http://www.xbrl.org/2003/role/label" xbrldt:closed="true" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_SecurityExchangeName" xlink:type="arc"/>
<link:presentationArc order="16" preferredLabel="http://www.xbrl.org/2003/role/label" xbrldt:closed="true" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_WrittenCommunications" xlink:type="arc"/>
<link:presentationArc order="17" preferredLabel="http://www.xbrl.org/2003/role/label" xbrldt:closed="true" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_SolicitingMaterial" xlink:type="arc"/>
<link:presentationArc order="18" preferredLabel="http://www.xbrl.org/2003/role/label" xbrldt:closed="true" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_PreCommencementTenderOffer" xlink:type="arc"/>
<link:presentationArc order="19" preferredLabel="http://www.xbrl.org/2003/role/label" xbrldt:closed="true" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_PreCommencementIssuerTenderOffer" xlink:type="arc"/>
<link:presentationArc order="20" preferredLabel="http://www.xbrl.org/2003/role/label" xbrldt:closed="true" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityEmergingGrowthCompany" xlink:type="arc"/>
<link:presentationArc order="21" preferredLabel="http://www.xbrl.org/2003/role/label" xbrldt:closed="true" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_AmendmentFlag" xlink:type="arc"/>
<link:presentationArc order="22" preferredLabel="http://www.xbrl.org/2003/role/label" xbrldt:closed="true" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityCentralIndexKey" xlink:type="arc"/>

</link:presentationLink>
</link:linkbase>
</XBRL>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>ZIP
<SEQUENCE>6
<FILENAME>0001437749-20-003598-xbrl.zip
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
begin 644 0001437749-20-003598-xbrl.zip
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M+>0C&-L/J6@.-.Z",B'_Z=CC875XQ\R1E]Q PRZ5E&7>#TBM9O:Y (9,%+E
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MC^'=]G' TS9;8L$2"]9%<S7>?N*K_GTD+&!+/J^Y <D$DX)O&ZK-:3VAF Z
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M!B=Q9Z<P_H4DV/"/#Z<2]:'^,XYW_@%02P,$%     @ +(%:4,31<XO%$P
MK'   !,   !O='1R,C R,# R,C1?.&LN:'1M[5WK;]LXMO^\!>[_P)MI9U/
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M4J#=Q*$A5_J480A9*\=[ADCL,]2?$?!(?#Y= X PD$P:0O(4>%EYLVM.=)<
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MELQT8(1AEHFX>-D++K/0IL #3&EB6S/>]=!@V!RWN?X@ $NA 1%GCIM=?Q@
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M     &]T='(M,C R,# R,C4N>'-D4$L! A0#%     @ +(%:4";Y9P+N!
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G='(R,#(P,#(R-%\X:RYH=&U02P4&      4 !0!) 0  ZB<

end
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>7
<FILENAME>ottr20200224_8k_htm.xml
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<XML>
<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2019-01-31"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="ottr-20200225.xsd" xlink:type="simple"/>
    <context id="d20208K">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001466593</identifier>
        </entity>
        <period>
            <startDate>2020-02-25</startDate>
            <endDate>2020-02-25</endDate>
        </period>
    </context>
    <dei:AmendmentFlag contextRef="d20208K">false</dei:AmendmentFlag>
    <dei:EntityCentralIndexKey contextRef="d20208K">0001466593</dei:EntityCentralIndexKey>
    <dei:DocumentType contextRef="d20208K">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate contextRef="d20208K">2020-02-25</dei:DocumentPeriodEndDate>
    <dei:EntityRegistrantName contextRef="d20208K">OTTER TAIL CORPORATION</dei:EntityRegistrantName>
    <dei:EntityIncorporationStateCountryCode contextRef="d20208K">MN</dei:EntityIncorporationStateCountryCode>
    <dei:EntityFileNumber contextRef="d20208K">0-53713</dei:EntityFileNumber>
    <dei:EntityTaxIdentificationNumber contextRef="d20208K">27-0383995</dei:EntityTaxIdentificationNumber>
    <dei:EntityAddressAddressLine1 contextRef="d20208K">215 South Cascade Street</dei:EntityAddressAddressLine1>
    <dei:EntityAddressAddressLine2 contextRef="d20208K">P.O. Box 496</dei:EntityAddressAddressLine2>
    <dei:EntityAddressCityOrTown contextRef="d20208K">Fergus Falls</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince contextRef="d20208K">MN</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode contextRef="d20208K">56538-0496</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode contextRef="d20208K">866</dei:CityAreaCode>
    <dei:LocalPhoneNumber contextRef="d20208K">410-8780</dei:LocalPhoneNumber>
    <dei:Security12bTitle contextRef="d20208K">Common Shares</dei:Security12bTitle>
    <dei:TradingSymbol contextRef="d20208K">OTTR</dei:TradingSymbol>
    <dei:SecurityExchangeName contextRef="d20208K">NASDAQ</dei:SecurityExchangeName>
    <dei:WrittenCommunications contextRef="d20208K">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial contextRef="d20208K">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer contextRef="d20208K">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer contextRef="d20208K">false</dei:PreCommencementIssuerTenderOffer>
    <dei:EntityEmergingGrowthCompany contextRef="d20208K">false</dei:EntityEmergingGrowthCompany>
</xbrl>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>8
<FILENAME>FilingSummary.xml
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<XML>
<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.19.3.a.u2</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>1</ContextCount>
  <ElementCount>95</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>0</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>0</UnitCount>
  <MyReports>
    <Report instance="ottr20200224_8k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>000 - Document - Document And Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ottr.com/20200225/role/statement-document-and-entity-information</Role>
      <ShortName>Document And Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="8-K" original="ottr20200224_8k.htm">ottr20200224_8k.htm</File>
    <File>ottr-20200225.xsd</File>
    <File>ottr-20200225_def.xml</File>
    <File>ottr-20200225_lab.xml</File>
    <File>ottr-20200225_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2019-01-31</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EXCEL
<SEQUENCE>9
<FILENAME>Financial_Report.xlsx
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
begin 644 Financial_Report.xlsx
M4$L#!!0    ( "R!6E ?(\\#P    !,"   +    7W)E;',O+G)E;'.MDD^+
MPD ,Q;]*F?L:5\'#8CUYZ6U9_ )Q)OU#.Y,A$[%^>X>];+=44/ 87O+>CT?V
M/S2@=AQ2V\54C'X(J32M:OP"2+8ECVG%D4)6:A:/FD=I(*+ML2'8K-<[D*F'
M.>RGGD7E2B.5^S3%":4A+<TXP)6E/S/WJVR;A5ND9T*YKCM+1[873T$7LF<;
M!I99-G\LCNVW<+ZT+/0:S>,*P).B0\5?UX^8 TBTH_0(:+L A#&^NQT:E8(C
M-R."?S]PN -02P,$%     @ +(%:4"?HAPZ"    L0   !    !D;V-0<F]P
M<R]A<' N>&UL38Y-"\(P$$3_2NG=;BGH06) L$?!D_>0;FP@R8;-"OGYIH(?
MMWF\81AU8\K(XK%T-8943OTJDH\ Q:X831F:3LTXXFBD(3^ G/,6+V2?$9/
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M_O"["?O>NKW[Q\970=7 K[M07U!+ P04    "  L@5I0F5R<(Q &  "<)P
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M4')O<',O87!P+GAM;%!+ 0(4 Q0    ( "R!6E#%:6/+[@   "L"   1
M          "  9D!  !D;V-0<F]P<R]C;W)E+GAM;%!+ 0(4 Q0    ( "R!
M6E"97)PC$ 8  )PG   3              "  ;8"  !X;"]T:&5M92]T:&5M
M93$N>&UL4$L! A0#%     @ +(%:4*U"YD:L @  _@L  !@
M ( !]P@  'AL+W=O<FMS:&5E=',O<VAE970Q+GAM;%!+ 0(4 Q0    ( "R!
M6E!GE[EO8@(  $L&   4              "  =D+  !X;"]S:&%R9613=')I
M;F=S+GAM;%!+ 0(4 Q0    ( "R!6E"ZH3F*UP$  #(&   -
M  "  6T.  !X;"]S='EL97,N>&UL4$L! A0#%     @ +(%:4##_Y')$ 0
M/ (   \              ( !;Q   'AL+W=O<FMB;V]K+GAM;%!+ 0(4 Q0
M   ( "R!6E#_P"8(O0   (4"   :              "  > 1  !X;"]?<F5L
M<R]W;W)K8F]O:RYX;6PN<F5L<U!+ 0(4 Q0    ( "R!6E +C]@#(0$  %<$
M   3              "  =42  !;0V]N=&5N=%]4>7!E<UTN>&UL4$L%!@
0   *  H @ (  "<4      $!

end
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>10
<FILENAME>R1.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
							function toggleNextSibling (e) {
							if (e.nextSibling.style.display=='none') {
							e.nextSibling.style.display='block';
							} else { e.nextSibling.style.display='none'; }
							}</script>
</head>
<body>
<span style="display: none;">v3.19.3.a.u2</span><table class="report" border="0" cellspacing="2" id="idp6629704928">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Document And Entity Information<br></strong></div></th>
<th class="th"><div>Feb. 25, 2020</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_DocumentInformationLineItems', window );"><strong>Document Information [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityRegistrantName', window );">Entity, Registrant Name</a></td>
<td class="text">OTTER TAIL CORPORATION<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_DocumentType', window );">Document, Type</a></td>
<td class="text">8-K<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_DocumentPeriodEndDate', window );">Document, Period End Date</a></td>
<td class="text">Feb. 25,  2020<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityIncorporationStateCountryCode', window );">Entity, Incorporation, State or Country Code</a></td>
<td class="text">MN<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityFileNumber', window );">Entity, File Number</a></td>
<td class="text">0-53713<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityTaxIdentificationNumber', window );">Entity, Tax Identification Number</a></td>
<td class="text">27-0383995<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressAddressLine1', window );">Entity, Address, Address Line One</a></td>
<td class="text">215 South Cascade Street<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressAddressLine2', window );">Entity, Address, Address Line Two</a></td>
<td class="text">P.O. Box 496<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressCityOrTown', window );">Entity, Address, City or Town</a></td>
<td class="text">Fergus Falls<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressStateOrProvince', window );">Entity, Address, State or Province</a></td>
<td class="text">MN<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressPostalZipCode', window );">Entity, Address, Postal Zip Code</a></td>
<td class="text">56538-0496<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_CityAreaCode', window );">City Area Code</a></td>
<td class="text">866<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_LocalPhoneNumber', window );">Local Phone Number</a></td>
<td class="text">410-8780<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_Security12bTitle', window );">Title of 12(b) Security</a></td>
<td class="text">Common Shares<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_TradingSymbol', window );">Trading Symbol</a></td>
<td class="text">OTTR<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_SecurityExchangeName', window );">Security Exchange Name</a></td>
<td class="text">NASDAQ<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_WrittenCommunications', window );">Written Communications</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_SolicitingMaterial', window );">Soliciting Material</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_PreCommencementTenderOffer', window );">Pre-commencement Tender Offer</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_PreCommencementIssuerTenderOffer', window );">Pre-commencement Issuer Tender Offer</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityEmergingGrowthCompany', window );">Entity, Emerging Growth Company</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_AmendmentFlag', window );">Amendment Flag</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityCentralIndexKey', window );">Entity, Central Index Key</a></td>
<td class="text">0001466593<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_AmendmentFlag">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_AmendmentFlag</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_CityAreaCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Area code of city</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_CityAreaCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_DocumentInformationLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentInformationLineItems</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_DocumentPeriodEndDate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented.  If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentPeriodEndDate</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:dateItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_DocumentType">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentType</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:submissionTypeItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressAddressLine1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Address Line 1 such as Attn, Building Name, Street Name</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressAddressLine1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressAddressLine2">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Address Line 2 such as Street or Suite number</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressAddressLine2</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressCityOrTown">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Name of the City or Town</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressCityOrTown</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressPostalZipCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Code for the postal or zip code</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressPostalZipCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressStateOrProvince">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Name of the state or province.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressStateOrProvince</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:stateOrProvinceItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityCentralIndexKey">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityCentralIndexKey</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:centralIndexKeyItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityEmergingGrowthCompany">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Indicate if registrant meets the emerging growth company criteria.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityEmergingGrowthCompany</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityFileNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityFileNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:fileNumberItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityIncorporationStateCountryCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Two-character EDGAR code representing the state or country of incorporation.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityIncorporationStateCountryCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:edgarStateCountryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityRegistrantName">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityRegistrantName</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityTaxIdentificationNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityTaxIdentificationNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:employerIdItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_LocalPhoneNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Local phone number for entity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_LocalPhoneNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_PreCommencementIssuerTenderOffer">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 13e<br> -Subsection 4c<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_PreCommencementIssuerTenderOffer</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_PreCommencementTenderOffer">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 14d<br> -Subsection 2b<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_PreCommencementTenderOffer</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_Security12bTitle">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Title of a 12(b) registered security.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_Security12bTitle</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:securityTitleItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_SecurityExchangeName">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Name of the Exchange on which a security is registered.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection d1-1<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_SecurityExchangeName</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:edgarExchangeCodeItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_SolicitingMaterial">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Section 14a<br> -Number 240<br> -Subsection 12<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_SolicitingMaterial</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_TradingSymbol">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Trading symbol of an instrument as listed on an exchange.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_TradingSymbol</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:tradingSymbolItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_WrittenCommunications">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Securities Act<br> -Number 230<br> -Section 425<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_WrittenCommunications</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
</body>
</html>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>11
<FILENAME>Show.js
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
// Edgar(tm) Renderer was created by staff of the U.S. Securities and Exchange Commission.  Data and content created by government employees within the scope of their employment are not subject to domestic copyright protection. 17 U.S.C. 105.
var Show={};Show.LastAR=null,Show.showAR=function(a,r,w){if(Show.LastAR)Show.hideAR();var e=a;while(e&&e.nodeName!='TABLE')e=e.nextSibling;if(!e||e.nodeName!='TABLE'){var ref=((window)?w.document:document).getElementById(r);if(ref){e=ref.cloneNode(!0);
e.removeAttribute('id');a.parentNode.appendChild(e)}}
if(e)e.style.display='block';Show.LastAR=e};Show.hideAR=function(){Show.LastAR.style.display='none'};Show.toggleNext=function(a){var e=a;while(e.nodeName!='DIV')e=e.nextSibling;if(!e.style){}else if(!e.style.display){}else{var d,p_;if(e.style.display=='none'){d='block';p='-'}else{d='none';p='+'}
e.style.display=d;if(a.textContent){a.textContent=p+a.textContent.substring(1)}else{a.innerText=p+a.innerText.substring(1)}}}
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>12
<FILENAME>report.css
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
/* Updated 2009-11-04 */
/* v2.2.0.24 */

/* DefRef Styles */
..report table.authRefData{
	background-color: #def;
	border: 2px solid #2F4497;
	font-size: 1em;
	position: absolute;
}

..report table.authRefData a {
	display: block;
	font-weight: bold;
}

..report table.authRefData p {
	margin-top: 0px;
}

..report table.authRefData .hide {
	background-color: #2F4497;
	padding: 1px 3px 0px 0px;
	text-align: right;
}

..report table.authRefData .hide a:hover {
	background-color: #2F4497;
}

..report table.authRefData .body {
	height: 150px;
	overflow: auto;
	width: 400px;
}

..report table.authRefData table{
	font-size: 1em;
}

/* Report Styles */
..pl a, .pl a:visited {
	color: black;
	text-decoration: none;
}

/* table */
..report {
	background-color: white;
	border: 2px solid #acf;
	clear: both;
	color: black;
	font: normal 8pt Helvetica, Arial, san-serif;
	margin-bottom: 2em;
}

..report hr {
	border: 1px solid #acf;
}

/* Top labels */
..report th {
	background-color: #acf;
	color: black;
	font-weight: bold;
	text-align: center;
}

..report th.void	{
	background-color: transparent;
	color: #000000;
	font: bold 10pt Helvetica, Arial, san-serif;
	text-align: left;
}

..report .pl {
	text-align: left;
	vertical-align: top;
	white-space: normal;
	width: 200px;
	white-space: normal; /* word-wrap: break-word; */
}

..report td.pl a.a {
	cursor: pointer;
	display: block;
	width: 200px;
	overflow: hidden;
}

..report td.pl div.a {
	width: 200px;
}

..report td.pl a:hover {
	background-color: #ffc;
}

/* Header rows... */
..report tr.rh {
	background-color: #acf;
	color: black;
	font-weight: bold;
}

/* Calendars... */
..report .rc {
	background-color: #f0f0f0;
}

/* Even rows... */
..report .re, .report .reu {
	background-color: #def;
}

..report .reu td {
	border-bottom: 1px solid black;
}

/* Odd rows... */
..report .ro, .report .rou {
	background-color: white;
}

..report .rou td {
	border-bottom: 1px solid black;
}

..report .rou table td, .report .reu table td {
	border-bottom: 0px solid black;
}

/* styles for footnote marker */
..report .fn {
	white-space: nowrap;
}

/* styles for numeric types */
..report .num, .report .nump {
	text-align: right;
	white-space: nowrap;
}

..report .nump {
	padding-left: 2em;
}

..report .nump {
	padding: 0px 0.4em 0px 2em;
}

/* styles for text types */
..report .text {
	text-align: left;
	white-space: normal;
}

..report .text .big {
	margin-bottom: 1em;
	width: 17em;
}

..report .text .more {
	display: none;
}

..report .text .note {
	font-style: italic;
	font-weight: bold;
}

..report .text .small {
	width: 10em;
}

..report sup {
	font-style: italic;
}

..report .outerFootnotes {
	font-size: 1em;
}
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>JSON
<SEQUENCE>13
<FILENAME>MetaLinks.json
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
{
 "instance": {
  "ottr20200224_8k.htm": {
   "axisCustom": 0,
   "axisStandard": 0,
   "contextCount": 1,
   "dts": {
    "definitionLink": {
     "local": [
      "ottr-20200225_def.xml"
     ]
    },
    "inline": {
     "local": [
      "ottr20200224_8k.htm"
     ]
    },
    "labelLink": {
     "local": [
      "ottr-20200225_lab.xml"
     ],
     "remote": [
      "https://xbrl.sec.gov/dei/2019/dei-doc-2019-01-31.xml"
     ]
    },
    "presentationLink": {
     "local": [
      "ottr-20200225_pre.xml"
     ]
    },
    "referenceLink": {
     "remote": [
      "https://xbrl.sec.gov/dei/2019/dei-ref-2019-01-31.xml"
     ]
    },
    "schema": {
     "local": [
      "ottr-20200225.xsd"
     ],
     "remote": [
      "https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd",
      "http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd",
      "http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd",
      "http://www.xbrl.org/2003/xl-2003-12-31.xsd",
      "http://www.xbrl.org/2003/xlink-2003-12-31.xsd",
      "http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd",
      "http://xbrl.sec.gov/currency/2017/currency-2017-01-31.xsd",
      "https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd",
      "http://www.xbrl.org/2005/xbrldt-2005.xsd",
      "http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd",
      "https://xbrl.sec.gov/exch/2018/exch-2018-01-31.xsd",
      "http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd",
      "http://xbrl.sec.gov/sic/2011/sic-2011-01-31.xsd",
      "https://xbrl.sec.gov/stpr/2018/stpr-2018-01-31.xsd",
      "http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd",
      "http://www.xbrl.org/lrr/role/net-2009-12-16.xsd",
      "http://www.xbrl.org/2006/ref-2006-02-27.xsd",
      "http://www.xbrl.org/lrr/role/deprecated-2009-12-16.xsd"
     ]
    }
   },
   "elementCount": 27,
   "entityCount": 1,
   "hidden": {
    "http://xbrl.sec.gov/dei/2019-01-31": 2,
    "total": 2
   },
   "keyCustom": 0,
   "keyStandard": 95,
   "memberCustom": 0,
   "memberStandard": 0,
   "nsprefix": "ottr",
   "nsuri": "http://www.ottr.com/20200225",
   "report": {
    "R1": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "body",
       "html"
      ],
      "baseRef": "ottr20200224_8k.htm",
      "contextRef": "d20208K",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "dei:EntityRegistrantName",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "document",
     "isDefault": "true",
     "longName": "000 - Document - Document And Entity Information",
     "role": "http://www.ottr.com/20200225/role/statement-document-and-entity-information",
     "shortName": "Document And Entity Information",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "body",
       "html"
      ],
      "baseRef": "ottr20200224_8k.htm",
      "contextRef": "d20208K",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "dei:EntityRegistrantName",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    }
   },
   "segmentCount": 0,
   "tag": {
    "dei_AmendmentFlag": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.",
        "label": "Amendment Flag"
       }
      }
     },
     "localname": "AmendmentFlag",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ottr.com/20200225/role/statement-document-and-entity-information"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_CityAreaCode": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Area code of city",
        "label": "City Area Code"
       }
      }
     },
     "localname": "CityAreaCode",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ottr.com/20200225/role/statement-document-and-entity-information"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_DocumentInformationLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Document Information [Line Items]"
       }
      }
     },
     "localname": "DocumentInformationLineItems",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ottr.com/20200225/role/statement-document-and-entity-information"
     ],
     "xbrltype": "stringItemType"
    },
    "dei_DocumentInformationTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Container to support the formal attachment of each official or unofficial, public or private document as part of a submission package.",
        "label": "Document Information [Table]"
       }
      }
     },
     "localname": "DocumentInformationTable",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "dei_DocumentPeriodEndDate": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented.  If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.",
        "label": "Document, Period End Date"
       }
      }
     },
     "localname": "DocumentPeriodEndDate",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ottr.com/20200225/role/statement-document-and-entity-information"
     ],
     "xbrltype": "dateItemType"
    },
    "dei_DocumentType": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.",
        "label": "Document, Type"
       }
      }
     },
     "localname": "DocumentType",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ottr.com/20200225/role/statement-document-and-entity-information"
     ],
     "xbrltype": "submissionTypeItemType"
    },
    "dei_EntityAddressAddressLine1": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Address Line 1 such as Attn, Building Name, Street Name",
        "label": "Entity, Address, Address Line One"
       }
      }
     },
     "localname": "EntityAddressAddressLine1",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ottr.com/20200225/role/statement-document-and-entity-information"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressAddressLine2": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Address Line 2 such as Street or Suite number",
        "label": "Entity, Address, Address Line Two"
       }
      }
     },
     "localname": "EntityAddressAddressLine2",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ottr.com/20200225/role/statement-document-and-entity-information"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressCityOrTown": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Name of the City or Town",
        "label": "Entity, Address, City or Town"
       }
      }
     },
     "localname": "EntityAddressCityOrTown",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ottr.com/20200225/role/statement-document-and-entity-information"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressPostalZipCode": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Code for the postal or zip code",
        "label": "Entity, Address, Postal Zip Code"
       }
      }
     },
     "localname": "EntityAddressPostalZipCode",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ottr.com/20200225/role/statement-document-and-entity-information"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressStateOrProvince": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Name of the state or province.",
        "label": "Entity, Address, State or Province"
       }
      }
     },
     "localname": "EntityAddressStateOrProvince",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ottr.com/20200225/role/statement-document-and-entity-information"
     ],
     "xbrltype": "stateOrProvinceItemType"
    },
    "dei_EntityCentralIndexKey": {
     "auth_ref": [
      "r5"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.",
        "label": "Entity, Central Index Key"
       }
      }
     },
     "localname": "EntityCentralIndexKey",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ottr.com/20200225/role/statement-document-and-entity-information"
     ],
     "xbrltype": "centralIndexKeyItemType"
    },
    "dei_EntityDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "All the names of the entities being reported upon in a document. Any legal structure used to conduct activities or to hold assets. Some examples of such structures are corporations, partnerships, limited liability companies, grantor trusts, and other trusts. This item does not include business and geographical segments which are included in the geographical or business segments domains.",
        "label": "Entity [Domain]"
       }
      }
     },
     "localname": "EntityDomain",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ottr.com/20200225/role/statement-document-and-entity-information"
     ],
     "xbrltype": "domainItemType"
    },
    "dei_EntityEmergingGrowthCompany": {
     "auth_ref": [
      "r5"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicate if registrant meets the emerging growth company criteria.",
        "label": "Entity, Emerging Growth Company"
       }
      }
     },
     "localname": "EntityEmergingGrowthCompany",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ottr.com/20200225/role/statement-document-and-entity-information"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_EntityFileNumber": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.",
        "label": "Entity, File Number"
       }
      }
     },
     "localname": "EntityFileNumber",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ottr.com/20200225/role/statement-document-and-entity-information"
     ],
     "xbrltype": "fileNumberItemType"
    },
    "dei_EntityIncorporationStateCountryCode": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Two-character EDGAR code representing the state or country of incorporation.",
        "label": "Entity, Incorporation, State or Country Code"
       }
      }
     },
     "localname": "EntityIncorporationStateCountryCode",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ottr.com/20200225/role/statement-document-and-entity-information"
     ],
     "xbrltype": "edgarStateCountryItemType"
    },
    "dei_EntityRegistrantName": {
     "auth_ref": [
      "r5"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.",
        "label": "Entity, Registrant Name"
       }
      }
     },
     "localname": "EntityRegistrantName",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ottr.com/20200225/role/statement-document-and-entity-information"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityTaxIdentificationNumber": {
     "auth_ref": [
      "r5"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.",
        "label": "Entity, Tax Identification Number"
       }
      }
     },
     "localname": "EntityTaxIdentificationNumber",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ottr.com/20200225/role/statement-document-and-entity-information"
     ],
     "xbrltype": "employerIdItemType"
    },
    "dei_LegalEntityAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The set of legal entities associated with a report.",
        "label": "Legal Entity [Axis]"
       }
      }
     },
     "localname": "LegalEntityAxis",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ottr.com/20200225/role/statement-document-and-entity-information"
     ],
     "xbrltype": "stringItemType"
    },
    "dei_LocalPhoneNumber": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Local phone number for entity.",
        "label": "Local Phone Number"
       }
      }
     },
     "localname": "LocalPhoneNumber",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ottr.com/20200225/role/statement-document-and-entity-information"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_PreCommencementIssuerTenderOffer": {
     "auth_ref": [
      "r2"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.",
        "label": "Pre-commencement Issuer Tender Offer"
       }
      }
     },
     "localname": "PreCommencementIssuerTenderOffer",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ottr.com/20200225/role/statement-document-and-entity-information"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_PreCommencementTenderOffer": {
     "auth_ref": [
      "r3"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.",
        "label": "Pre-commencement Tender Offer"
       }
      }
     },
     "localname": "PreCommencementTenderOffer",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ottr.com/20200225/role/statement-document-and-entity-information"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_Security12bTitle": {
     "auth_ref": [
      "r0"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Title of a 12(b) registered security.",
        "label": "Title of 12(b) Security"
       }
      }
     },
     "localname": "Security12bTitle",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ottr.com/20200225/role/statement-document-and-entity-information"
     ],
     "xbrltype": "securityTitleItemType"
    },
    "dei_SecurityExchangeName": {
     "auth_ref": [
      "r1"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Name of the Exchange on which a security is registered.",
        "label": "Security Exchange Name"
       }
      }
     },
     "localname": "SecurityExchangeName",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ottr.com/20200225/role/statement-document-and-entity-information"
     ],
     "xbrltype": "edgarExchangeCodeItemType"
    },
    "dei_SolicitingMaterial": {
     "auth_ref": [
      "r4"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.",
        "label": "Soliciting Material"
       }
      }
     },
     "localname": "SolicitingMaterial",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ottr.com/20200225/role/statement-document-and-entity-information"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_TradingSymbol": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Trading symbol of an instrument as listed on an exchange.",
        "label": "Trading Symbol"
       }
      }
     },
     "localname": "TradingSymbol",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ottr.com/20200225/role/statement-document-and-entity-information"
     ],
     "xbrltype": "tradingSymbolItemType"
    },
    "dei_WrittenCommunications": {
     "auth_ref": [
      "r6"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.",
        "label": "Written Communications"
       }
      }
     },
     "localname": "WrittenCommunications",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ottr.com/20200225/role/statement-document-and-entity-information"
     ],
     "xbrltype": "booleanItemType"
    }
   },
   "unitCount": 0
  }
 },
 "std_ref": {
  "r0": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "b"
  },
  "r1": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "d1-1"
  },
  "r2": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "13e",
   "Subsection": "4c"
  },
  "r3": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "14d",
   "Subsection": "2b"
  },
  "r4": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "14a",
   "Subsection": "12"
  },
  "r5": {
   "Name": "Regulation 12B",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "b-2"
  },
  "r6": {
   "Name": "Securities Act",
   "Number": "230",
   "Publisher": "SEC",
   "Section": "425"
  }
 },
 "version": "2.1"
}
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
