Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Investments in Debt Securities (Parenthetical) (Details) $ in Millions	Jun. 30, 2024 USD ($)
Accounting Policies [Abstract]
Cash and cash equivalents of money market accounts	$ 4.9

Cash and cash equivalents of money market accounts.

No definition available.

Name:	genk_CashAndCashEquivalentsOfMoneyMarketAccounts
Namespace Prefix:	genk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant