Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan, attributable to parent.

No definition available.

Name:	ssii_OtherComprehensiveIncomeDefinedBenefitPlanAdjustmentNetOfTaxPortionAttributableToParent
Namespace Prefix:	ssii_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Income Tax - Schedule of Deferred Income Taxes Recognized (Details) - USD ($)	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Deferred taxes benefit / (expense) recognized on:
Total	$ (1,203)
Federal [Member]
Deferred taxes benefit / (expense) recognized on:
Total
State [Member]
Deferred taxes benefit / (expense) recognized on:
Total
Retirement Benefits [Member]
Deferred taxes benefit / (expense) recognized on:
Total	$ (1,203)