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Schedule of Allowance for Credit Losses (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]
Insurance assignments, allowance for credit losses, beginning		$ 1,481,032	$ 1,535,324	$ 1,536,926	$ 1,553,836
Insurance assignments, allowance for credit losses, change in provision	[1]	248,408	259,643	799,460	752,256
Insurance assignments, allowance for credit losses, charge-offs		(194,483)	(254,132)	(801,429)	(765,257)
Insurance assignments, allowance for credit losses, ending		$ 1,534,957	$ 1,540,835	$ 1,534,957	$ 1,540,835
[1] Included in other expenses on the condensed consolidated statements of earnings

X

- Definition

Allowance for credit losses,premiums and other receivables change in provision.

+ References

No definition available.

+ Details

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Namespace Prefix:	SNFCA_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Allowance for credit losses premiums and other receivables chargeoffs.

+ References

No definition available.

+ Details

Name:	SNFCA_AllowanceForCreditLossesPremiumsAndOtherReceivablesChargeOffs
Namespace Prefix:	SNFCA_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The valuation allowance as of the balance sheet date to reduce the gross amount of receivables to estimated net realizable value, which would be presented in parentheses on the face of the balance sheet.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-4

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration