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v3.23.2

Employee Benefits (Details Narrative) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Apr. 30, 2023 | Apr. 30, 2022
Defined Benefit Plan Disclosure [Line Items] |  |
Contribution percentage | 100.00% |
Contribution percentage | 3.00% |
Employee contribution percentage | 6.00% |
Employee Benefits and Share-Based Compensation | $ 1.5 | $ 1.2
Retirement Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employee Benefits and Share-Based Compensation | $ 0.3 | $ 0.1
Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Contribution percentage | 1.00% |
Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Contribution percentage | 9.00% |

X
- Definition Contribution percentage. + References No definition available. + Details
Name: | OPTT_ContributionPercentage
Namespace Prefix: | OPTT_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Employee contribution percentage. + References No definition available. + Details
Name: | OPTT_EmployeeContributionPercentage
Namespace Prefix: | OPTT_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Employee contribution percentage maximum. + References No definition available. + Details
Name: | OPTT_EmployeeContributionPercentageMaximum
Namespace Prefix: | OPTT_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition 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. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of expense for employee benefit and equity-based compensation. + References No definition available. + Details
Name: | us-gaap_EmployeeBenefitsAndShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_PlanNameAxis=OPTT_RetirementPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |