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Reconciliation of Revenues from Cemetery and mortuary contracts to Business Segment Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Pre-need merchandise and services	$ 3,688,579	$ 3,601,638
At-need specialty merchandise	29,688	5,302
Pre-need land sales
Deferred policy and pre-need contract acquisition costs	$ 3,718,267	$ 3,606,940

X

- Definition

At-need specialty merchandise.

+ References

No definition available.

+ Details

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

X

- Definition

Deferred policy and pre-need contract acquisition costs.

+ References

No definition available.

+ Details

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

X

- Definition

Pre-need land sales.

+ References

No definition available.

+ Details

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

X

- Definition

Pre-need merchandise and services.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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