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Warrants (Details Narrative) - $ / shares	Apr. 08, 2019	Jul. 22, 2016	Jun. 02, 2016	Jan. 31, 2021
Pre-funded Warrants [Member]
Warrant to purchase shares common stock	3,385,680
Warrant exercise price per share	$ 0.01
Second Amended Purchase Agreement [Member]
Number of common stock shares sold		29,750	20,850
Warrant to purchase shares common stock		8,925	7,298
Warrant exercise price per share		$ 187.20	$ 121.60
Class of warrant or right, expiration period		5 years	5 years
Number of exercised warrants
Securities Purchase Agreement [Member]
Number of common stock shares sold	1,542,000
Warrant to purchase shares common stock	4,927,680
Warrant exercise price per share	$ 3.85
Class of warrant or right, expiration period	5 years
Number of exercised warrants				677,500

X

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

No definition available.

+ Details

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Namespace Prefix:	OPTT_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of exercised warrants.

+ References

No definition available.

+ Details

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Namespace Prefix:	OPTT_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Definition

Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

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Period Type:	instant

X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: