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Schedule of Reconciliation of Revenues from Cemetery and mortuary contracts to Business Segment Information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Revenue from Contract with Customer [Abstract] |  |
Pre-need merchandise and services | $ 3,951,267 | $ 3,780,173
At-need specialty merchandise | 23,090 | 35,371
Pre-need land sales |  |
Deferred policy and pre-need contract acquisition costs | $ 3,974,357 | $ 3,815,544

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