Note 12 - Lease Obligations (Details Textual) - USD ($)	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	May 27, 2021
Operating Lease, Expense	$ 1,200,000	$ 0
Lazarus Energy Holdings (LEH) [Member]
Sublease Income	30,000.00	30,000.00
Office Lease of Corporate Headquarters in Houston, Texas [Member]
Rent per Square Foot	30	$ 31
Lessee, Operating Lease, Monthly Rent Expense			$ 20,000.00
Office Lease of Corporate Headquarters in Houston, Texas [Member] \| Lazarus Energy Holdings (LEH) [Member]
Sublease Income	$ 30,000.00

Amount of monthly rent expense of operating lease of the lessee.

No definition available.

Name:	bdco_LesseeOperatingLeaseMonthlyRentExpense
Namespace Prefix:	bdco_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of rent based on square footage.

+ References

No definition available.

+ Details

Name:	bdco_RentPerSquareFoot
Namespace Prefix:	bdco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479041/842-20-45-4

+ Details

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

- Definition

Amount of sublease income excluding finance and operating lease expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 53
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479589/842-20-55-53

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-4

+ Details

Name:	us-gaap_SubleaseIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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

- Details

Name:	us-gaap_LeaseContractualTermAxis=bdco_OfficeLeaseOfCorporateHeadquartersInHoustonTexasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: