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Note 16 - Subsequent Events - Summary of Stock Incentive Awards to Executive Officers Under the 2014 Stock Incentive Plan (Details) - Subsequent Event [Member] - Executive Officer [Member]	Feb. 12, 2020 shares
The 2014 Stock Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]
Shares/Units Granted (in shares)	15,300
The 2014 Stock Incentive Plan Under Executive Agreement [Member] | Performance Shares [Member]
Shares/Units Granted (in shares)	47,600
Vesting date	Dec. 31, 2022
The 2014 Stock Incentive Plan Under Legacy Agreement [Member] | Performance Shares [Member]
Shares/Units Granted (in shares)	7,400
Vesting date	Dec. 31, 2022

X

- Definition

Represents award vesting date under share-based compensation arrangement.

+ References

No definition available.

+ Details

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Namespace Prefix:	ottr_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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