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Description of business and summary of significant accounting policies, Real Estate Not Owned (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Real Estate Not Owned [Abstract]
Real Estate Not Owned	$ 13,617	$ 16,815
Liabilities related to real estate not owned	$ 13,617	$ 16,815

X

- Definition

The amount of liabilities related to real estate that is not owned.

+ References

No definition available.

+ Details

Name:	sdhc_LiabilitiesRelatedToRealEstateNotOwned
Namespace Prefix:	sdhc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Carrying amount as of the balance sheet date of real estate not owned.

+ References

No definition available.

+ Details

Name:	sdhc_RealEstateNotOwned
Namespace Prefix:	sdhc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	sdhc_RealEstateNotOwnedAbstract
Namespace Prefix:	sdhc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration