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14) Revenues From Contracts With Customers (Details) - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Text Block [Abstract] |  |  |  |
Revenue recognized included in the opening contract liability | $ 880,633 | $ 889,578 | $ 1,831,406 | $ 1,631,098

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- 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

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- References No definition available. + Details
Name: | us-gaap_TextBlockAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration