14) Revenues From Contracts With Customers (Details) - USD ($)	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Text Block [Abstract]
Revenue recognized included in the opening contract liability	$ 950,772	$ 741,520

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

No definition available.

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