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14) Revenues From Contracts With Customers (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Text Block [Abstract]
Revenue recognized included in the opening contract liability	$ 1,427,418	$ 884,180	$ 3,258,824	$ 2,515,278

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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.

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Namespace Prefix:	snfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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No definition available.

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Name:	us-gaap_TextBlockAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration