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Warrants (Details Narrative) - $ / shares | Apr. 08, 2019 | Jul. 22, 2016 | Jun. 02, 2016 | Oct. 31, 2020
--- | --- | --- | --- | ---
Pre-funded Warrants [Member] |  |  |  |
Warrant to purchase shares common stock | 3,385,680 |  |  |
Warrant exercise price per share | $ 0.01 |  |  |
Securities Purchase Agreement [Member] |  |  |  |
Number of common stock shares sold | 1,542,000 |  | 20,850 |
Warrant to purchase shares common stock | 4,927,680 |  | 7,298 |
Warrant exercise price per share | $ 3.85 |  | $ 121.60 |
Class of warrant or right, expiration period | 5 years |  | 5 years |
Number of exercised warrants |  |  |  |
Second Amended Purchase Agreement [Member] |  |  |  |
Number of common stock shares sold |  | 29,750 |  |
Warrant to purchase shares common stock |  | 8,925 |  |
Warrant exercise price per share |  | $ 187.20 |  |
Class of warrant or right, expiration period |  | 5 years |  |
Number of exercised warrants |  |  |  |

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
Name: | OPTT_NumberOfExercisedWarrants
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_
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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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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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X
- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |