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Revenues from Contracts with Customers (Details Narrative) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Revenue from Contract with Customer [Abstract] |  |  |  |
Revenue recognized included in the opening contract liability | $ 1,309,936 | $ 880,663 | $ 2,444,937 | $ 1,831,406

X
- Definition Represents the monetary amount of Revenue Recognized Included in the Opening Contract Liability, during the indicated time period. + References No definition available. + Details
Name: | snfc_RevenueRecognizedIncludedInTheOpeningContractLiability
Namespace Prefix: | snfc_
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