Other Income (Details)	3 Months Ended
Mar. 31, 2023 USD ($)
Other (income) expense, net
Other Income [Line Items]
Reimbursements received	$ 115,000

Amount of reimbursements received from reimbursement fund for costs incurred on repacking and continuing to carry signals of reassigned broadcast stations.

No definition available.

Name:	sga_ReimbursementsReceivedForCostsIncurredRelatedToRepack
Namespace Prefix:	sga_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration