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Schedule of Accumulated Balances of Other Comprehensive Income (Details) - USD ($)

3 Months Ended

12 Months Ended

Mar. 31, 2025

Dec. 31, 2024

Equity [Abstract]

Unrealized gains on fix maturity securities available-for-sale

$ (6,941,915)

$ (6,876,629)

Increase (Decrease) in Unrealized gains on fixed maturity securities available-for-sale

2,992,278

(65,286)

Unrealized gains on fix maturity securities available-for-sale

(3,949,637)

(6,941,915)

Unrealized gains (losses) on restricted assets

(4,126)

^[1]

(4,757)

^[2]

Increase Dececrease in Unrealized gains (losses) on restricted assets

3,220

^[1]

631

^[2]

Unrealized gains (losses) on restricted assets

^[1]

(906)

(4,126)

Unrealized gains (losses) on cemetery perpetual care trust investments

(5,225)

^[1]

(4,172)

^[2]

Increase Dececrease in Unrealized gains (losses) on cemetery perpetual care trust investments

2,114

^[1]

(1,053)

^[2]

Unrealized gains (losses) on cemetery perpetual care trust investments

^[1]

(3,111)

(5,225)

Other comprehensive income (loss), Balance

(6,951,266)

(6,885,558)

Increase (Decrease) in Other comprehensive income (loss), Balance

2,997,612

(65,708)

Other comprehensive income (loss), Balance

$ (3,953,654)

$ (6,951,266)

[1]	Fixed maturity securities available for sale
[2]	Fixed maturity securities available for sale

X

- Definition

Represents the monetary amount of Increase Dececrease in Unrealized gains on cemetery perpetual care trust investments, during the indicated time period.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Represents the monetary amount of Increase Dececrease in Unrealized gains on restricted assets, during the indicated time period.

+ References

No definition available.

+ Details

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Namespace Prefix:	SNFCA_
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X

- Definition

Represents the monetary amount of Increase (Decrease) in Other comprehensive income (loss), Balance, during the indicated time period.

+ References

No definition available.

+ Details

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Namespace Prefix:	SNFCA_
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Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the monetary amount of Increase (Decrease) in Unrealized gains on fixed maturity securities available-for-sale, during the indicated time period.

+ References

No definition available.

+ Details

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X

- Definition

Represents the monetary amount of Unrealized gains on cemetery perpetual care trust investments, as of the indicated date.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the monetary amount of Unrealized gains on restricted assets, as of the indicated date.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the monetary amount of Unrealized gains on fix maturity securities available-for-sale, as of the indicated date.

+ References

No definition available.

+ Details

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Namespace Prefix:	SNFCA_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-11

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (g)(2)(ii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480016/944-40-65-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (h)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480016/944-40-65-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(30)(a)(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(23)(a)(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-14

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- References

No definition available.

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