Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense of intangible assets	$ 401	$ 224

Amortization of intangible assets including cost of sales.

No definition available.

Name:	slgd_AmortizationOfIntangibleAssetsIncludingCostOfSales
Namespace Prefix:	slgd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration