STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY (DEFICIT) (Parentheticals) - Class B Ordinary Shares [Member] - shares	Dec. 31, 2025	Mar. 25, 2025
Surrender shares (in Shares)		1,354,317
Maximum [Member]
Ordinary shares subject to forfeiture (in Shares)	760,850

Number of shares of common stock subject to forfeiture if the over-allotment option was not exercised by the underwriters.

No definition available.

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Namespace Prefix:	gteru_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant