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Income Tax Expenses - Schedule of Components of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($)	Mar. 31, 2026	Dec. 31, 2025
Schedule of Components of Deferred Tax Assets and Deferred Tax Liabilities [Abstract]
Fair value gain of Bitcoin	$ 43,379,426	$ 69,946,762
Less: Net operating loss carry forward	(6,057,596)	(5,330,420)
Total deferred tax liabilities	$ 37,321,830	$ 64,616,342

X

- Definition

The amount of deferred tax liabilities fair value gain of bitcoin.

+ References

No definition available.

+ Details

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Namespace Prefix:	nxtt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of deferred tax liabilities net operating loss carry forward.

+ References

No definition available.

+ Details

Name:	nxtt_DeferredTaxLiabilitiesNetOperatingLossCarryForward
Namespace Prefix:	nxtt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant