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Commitments and Contingencies (Details Textual) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 9 Months Ended
--- | --- | ---
May 31, 2012 | Sep. 30, 2012
Commitments and Contingencies (Textual) [Abstract] |  |
Number of securities owned |  | 0
Charter Agreement Period |  | 90 days
Charter agreement period extended |  | 30 days
Amended senior convertible note | $ 8 |
Expecting to receive cash proceeds |  | 41
United Kingdom [Member] |  |
Commitments and Contingencies (Textual) [Abstract] |  |
Contracted to pay cash |  | 5
Galt Resources [Member] |  |
Commitments and Contingencies (Textual) [Abstract] |  |
Contracted to pay cash |  | 15
Third Party [Member] |  |
Commitments and Contingencies (Textual) [Abstract] |  |
Project financing |  | 10
Cash paid for project financing |  | 10
Maximum [Member] |  |
Commitments and Contingencies (Textual) [Abstract] |  |
Renewed term loan payment |  | 5
Property and Equipment , Estimated Useful life |  | 10 years
Minimum [Member] |  |
Commitments and Contingencies (Textual) [Abstract] |  |
Renewed term loan payment |  | $ 3
Property and Equipment , Estimated Useful life |  | 3 years

X
- Definition Additional proceeds from amended senior convertible notes. + References No definition available. + Details
Name: | omex_AdditionalProceedsFromAmendedSeniorConvertibleNotes
Namespace Prefix: | omex_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Charter agreement period. + References No definition available. + Details
Name: | omex_CharterAgreementPeriod
Namespace Prefix: | omex_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Charter agreement period extended. + References No definition available. + Details
Name: | omex_CharterAgreementPeriodExtended
Namespace Prefix: | omex_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Commitments and contingencies contractual payment. + References No definition available. + Details
Name: | omex_CommitmentsAndContingenciesContractualPayment
Namespace Prefix: | omex_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Commitments and contingencies payment for project financing. + References No definition available. + Details
Name: | omex_CommitmentsAndContingenciesPaymentForProjectFinancing
Namespace Prefix: | omex_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | omex_CommitmentsAndContingenciesTextualAbstract
Namespace Prefix: | omex_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Expecting to receive cash proceeds. + References No definition available. + Details
Name: | omex_ExpectingToReceiveCashProceeds
Namespace Prefix: | omex_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of securities owned. + References No definition available. + Details
Name: | omex_NumberOfSecuritiesOwned
Namespace Prefix: | omex_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Payments on term loan. + References No definition available. + Details
Name: | omex_PaymentsOnTermLoan
Namespace Prefix: | omex_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Project financing. + References No definition available. + Details
Name: | omex_ProjectFinancing
Namespace Prefix: | omex_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration