Note 7 - Leases 2 (Details Textual) $ in Millions	Jun. 30, 2026 USD ($)
Time Charter Agreement Marine Bunkering Vessel [Member] \| Location, Statement of Financial Position, Balance [Axis]: us-gaap:AccountsPayableCurrent
Operating Lease, Early Termination Fee and Rent Payable	$ 1.9

Amount of early termination fee and rent payable under operating lease.

No definition available.

Name:	slng_OperatingLeaseEarlyTerminationFeeAndRentPayable
Namespace Prefix:	slng_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant