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23) Revenues From Contracts With Customers (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure Text Block [Abstract]
Deferred pre-need cemetery and mortuary contract revenues	$ 13,080,179	$ 12,607,978
Pre-need merchandise and services	12,545,753	12,325,437
At-need specialty merchandise	534,426	282,541
Pre-need land sales	0	0
Revenue Included in Opening Contract Liability	$ 4,359,709	$ 3,558,103

X

- Definition

Represents the monetary amount of At-need specialty merchandise, during the indicated time period.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the monetary amount of Pre-need land sales, during the indicated time period.

+ References

No definition available.

+ Details

Name:	snfc_PreNeedLandSales
Namespace Prefix:	snfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the monetary amount of Pre-need merchandise and services, during the indicated time period.

+ References

No definition available.

+ Details

Name:	snfc_PreNeedMerchandiseAndServices
Namespace Prefix:	snfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the monetary amount of Revenue Included in Opening Contract Liability, during the indicated time period.

+ References

No definition available.

+ Details

Name:	snfc_RevenueIncludedInOpeningContractLiability
Namespace Prefix:	snfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(5))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

X

- References

No definition available.

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