The amount of additional layers of asset retirement obligation.

No definition available.

Name:	bgl_AdditionalLayersOfAssetRetirementObligation
Namespace Prefix:	bgl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of asset retirement obligation, inflation rate.

+ References

No definition available.

+ Details

Name:	bgl_AssetRetirementObligationInflationRate
Namespace Prefix:	bgl_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of asset retirement obligation, market risk premium.

+ References

No definition available.

+ Details

Name:	bgl_AssetRetirementObligationMarketRiskPremium
Namespace Prefix:	bgl_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Period between remaining term.

+ References

No definition available.

+ Details

Name:	bgl_AssetRetirementObligationRemainingTerm
Namespace Prefix:	bgl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481879/410-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481850/410-20-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476148/220-40-50-22

+ Details

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

- Definition

Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481850/410-20-50-1

+ Details

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

- 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_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted-average risk-free rate used to discount claim liability for financial guarantee insurance contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480081/944-40-50-9

+ Details

Name:	us-gaap_FinancialGuaranteeInsuranceContractsClaimLiabilityWeightedAverageRiskFreeDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_CounterpartyNameAxis=bgl_BGLMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=bgl_BGLsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Asset Retirement Obligations (Details) - USD ($)		6 Months Ended		12 Months Ended
Asset Retirement Obligations (Details) - USD ($)	May 15, 2024	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025	Dec. 31, 2024
Asset Retirement Obligations [Line Items]
Asset retirement obligation (in Dollars)		$ 18,936,000		$ 17,833,000	$ 13,937,000
Accretion expense		1,103,000	$ 871,000
Additional layers of asset retirement obligation
BGL [Member] \| Fair Value, Inputs, Level 1 [Member]
Asset Retirement Obligations [Line Items]
Remaining term	18 years 3 months 18 days
Risk-free discount rate percentage	12.50%
Inflation rate	4.65%
Market risk premium rate	5.50%
BGL [Member] \| Fair Value, Inputs, Level 2 [Member]
Asset Retirement Obligations [Line Items]
Remaining term					18 years 8 months 12 days
Risk-free discount rate percentage					11.00%
Inflation rate					4.91%
Market risk premium rate					5.00%
BGL [Member] \| Fair Value, Inputs, Level 3 [Member]
Asset Retirement Obligations [Line Items]
Remaining term				18 years 8 months 12 days
Risk-free discount rate percentage				13.00%
Inflation rate				4.86%
Market risk premium rate				5.00%
BGL’s [Member]
Asset Retirement Obligations [Line Items]
Accretion expense		$ 1,103,000	$ 871,000