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14) Revenues From Contracts With Customers (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Text Block [Abstract]
Revenue recognized included in the opening contract liability	$ 1,135,001	$ 950,772

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- Definition

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

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No definition available.

+ Details

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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