Commitments and Contingencies - Additional Information (Detail)	Jun. 30, 2025 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Future minimum charter revenues next twelve months	$ 802,100

Future minimum payments due future minimum sublease rentals for next twelve months

No definition available.

Name:	ciss_FutureMinimumPaymentsDueFutureMinimumSubleaseRentalsForNextTwelveMonths
Namespace Prefix:	ciss_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant