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Schedule of Other Revenues (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Total	$ 5,167,508	$ 4,113,658
Total	4,606,298	3,468,522
Contractual Servicing Fees [Member]
Total	4,506,260	3,387,472
Late Fees [Member]
Total	$ 100,038	$ 81,050

X

- Definition

Other revenues.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of revenue and income classified as other.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.4)
-URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

+ Details

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

X

- Details

Name:	srt_ProductOrServiceAxis=SNFCA_ContractualServicingFeesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: