XML 85 R71.htm IDEA: XBRL DOCUMENT
v3.24.2

Employee Benefits (Details Narrative) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Apr. 30, 2024 | Apr. 30, 2023
Defined Benefit Plan Disclosure [Line Items] |  |
Contribution percentage | 100.00% |
Employee contribution percentage | 3.00% |
Employee contribution percentage maximum | 6.00% |
Employee benefits and share-based compensation | $ 1.2 | $ 1.5
Retirement Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employee benefits and share-based compensation | $ 0.3 | $ 0.3
Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employee contribution percentage | 1.00% |
Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employee contribution percentage | 9.00% |

X
- 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

X
- 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

X
- 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

X
- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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

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

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

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