Advance payments recevied amount.

No definition available.

Name:	GTLL_AdvancePaymentsReceviedAmount
Namespace Prefix:	GTLL_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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+ Details

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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+ Details

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

- Definition

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

+ References

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-Publisher FASB
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+ Details

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

- Definition

The cash outflow for the payment of a long-term borrowing made from a related party where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Payments for Advances from Affiliates.

+ References

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+ Details

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

- Details

Name:	us-gaap_DebtInstrumentAxis=GTLL_SeniorSecuredPromissoryNoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=GTLL_TersusPowerIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

SCHEDULE OF NOTE RECEIVABLE (Details) (Parenthetical) - USD ($)			6 Months Ended
	Jan. 13, 2022	Dec. 14, 2021	Dec. 31, 2021	Dec. 31, 2020
Maturity date	Jan. 13, 2023
Advanced payment to borrower			$ 405
Senior Secured Promissory Note [Member] \| Tersus Power Inc [Member]
Principal amount		$ 500,000
Maturity date description		The Note shall bear interest at 5% annually, be amortized over 25 years and the Borrower shall pay the full amount of principal and interest in one balloon payment on December 14, 2026 (the “Maturity Date”).
Bear interest rate, percentage		5.00%
Maturity date		Dec. 14, 2026
Advanced payment amount		$ 37,500
Advanced payment to borrower			$ 150,000
Senior Secured Promissory Note [Member] \| Tersus Power Inc [Member] \| Maximum [Member]
Advance borrower fund, amount		$ 500,000