XML 74 R63.htm IDEA: XBRL DOCUMENT v3.20.2

Commitments and Contingencies (Details Narrative)	Mar. 03, 2020 $ / shares	Aug. 28, 2018 USD ($)	Oct. 31, 2020 USD ($)	Oct. 31, 2020 EUR (€)	Jul. 31, 2020 USD ($)	Jul. 31, 2020 EUR (€)	Apr. 30, 2020 USD ($)	Apr. 30, 2020 EUR (€)
Share price per share | $ / shares	$ 1.00
Nasdaq delisting notification description	The Company received notification from Nasdaq that, as a result of the closing bid price of the Company's common stock being over $1.00 for 10 consecutive trading days, the Company has regained compliance with Listing Rule 5550(a)(2) to maintain the listing of its common stock on Nasdaq and Nasdaq considers the matter closed.
Selling, General and Administrative [Member] | Tax Authority, Spain [Member]
Income tax examination, penalties and interest accrued | $			$ 326,000		$ 331,000		$ 177,000
Selling, General and Administrative [Member] | Tax Authority, Spain [Member] | Euro [Member]
Income tax examination, penalties and interest accrued						€ 279,870
Selling, General and Administrative [Member] | Tax Authority, Spain [Member] | Euro [Member] | Recorded Additional Penalty [Member]
Income tax examination, penalties and interest accrued				€ 117,146
Selling, General and Administrative [Member] | Tax Authority, Spain [Member] | Euro [Member]
Income tax examination, penalties and interest accrued				€ 279,870				€ 162,724
Charles F. Dunleavy [Member]
Damages sought value | $		$ 5,000,000

X

- Definition

Nasdaq delisting notification description.

+ References

No definition available.

+ Details

Name:	OPTT_NasdaqDelistingNotificationDescription
Namespace Prefix:	OPTT_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

+ Details

Name:	us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

+ Details

Name:	us-gaap_LossContingencyDamagesSoughtValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Per share or per unit amount of equity securities issued.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_TaxAuthoritySpainMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AwardTypeAxis=OPTT_EURMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=OPTT_RecordedAdditionalPenaltyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AwardTypeAxis=currency_EUR
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=OPTT_CharlesFDunleavyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: