Note 2 - Summary of Significant Accounting Policies - Summary of Contract Liabilities (Details) - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenue recognized related to contract liabilities as of the beginning of the respective period	$ 40,000	$ 0	$ 50,000	$ 234,000

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due including opening balance.

No definition available.

Name:	sle_ContractWithCustomerLiabilityRevenueRecognizedIncludingOpeningBalance
Namespace Prefix:	sle_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration